Blog Dino
1 . Tyrannosaurus
Tyrannosaurus rex was one of the largest meat-eating dinosaurs that ever lived . Everything about this ferocious predator , from the thick , heavy skull to ( 1.2 meters long ) jaw 4 - foot - long , designed for maximum action - menghancurkan.Bukti bone fossil shows that Tyrannosaurus was about 40 feet ( 12 meters ) and length approximately 15 to 20 feet ( 4.6 to 6 meters ) high . Strong thighs and long , powerful tail helped it move quickly , and the 5 - foot - long ( 1.5 meters long ) skull could give birth to a very large mangsanya.T . rex serrated , conical teeth were most likely used to pierce and grip flesh , which then ripped with muscles muscular neck . Two finger sleeves that might seize their prey , but they are too short to reach mulutnya.Para Scientists believe this powerful predator could eat up to 500 pounds ( 230 kilograms ) of meat in one bite . Fossils of T. rex prey , including Triceratops and Edmontosaurus , suggest T. rex crushed and broken bones such as eating , and fractures have been found in kotorannya.Tyrannosaurus rex lived in forested river valleys in North America during the late Cretaceous period . It became extinct about 65 million years ago in the Cretaceous - Tertiary mass extinction .types : prehistoric diet : carnivorous Size : 40 ft ( 12 m ) long , 15 to 20 ft ( 4.6 to 6 m ) Protection Status : endangered Meaning From : Tyrannosaurus means " tyrant lizard . "
2 . Xiphactinus Audax
Xiphactinus is one of the largest bony fish of the Cretaceous and is considered one of the fiercest creatures in the sea . A powerful tail and winglike pectoral fins shot 17 - foot - long ( 5 meters long ) monster through the surface of the sea water . Fish and unsuspecting seabirds were snared in Malang reverse Xiphactinus jaw , which is lined with giant , fanglike teeth , giving an expression similar to that of bulldog.A 13 - foot - long ( 4 - meter-long ) Xiphactinus can open wide enough to swallow a six - foot - long ( two- meter-long ) fish around the jaw , but it itself is sometimes prey Cretoxyrhina controlled hiu.Xiphactinus ancient ocean called the Western Interior Seaway , which covered much of central North America during the Cretaceous . Although long extinct , if alive today the bony fish would look like a giant , fanged tarpon .Food : CarnivoresSize : Length up to 17 ft ( 5 m )Protection status : ExtinctDid you ? : A Xiphactinus on display in a museum in Kansas have a complete , well-preserved fish in it . Scientists believe that the struggling prey ruptured organs such as the ingested captors , killing the larger fish .3 . Lesothosaurus Diagnosticus
Lesothosaurus ornithischians diagnosticus is one of the earliest and most primitive , or " bird - hipped " dinosaurs . Ornithischians is one of two major groups of dinosaurs and include familiar species such as armored Stegosaurus and Ankylosaurus and Triceratops horns tiga.Lesothosaurus small , nimble , and bipedal , apparently bearing little resemblance to a giant , four-legged ornithischians that came later . But physical characteristics , such as hip and jaw structure and teeth are designed for chewing plants , Lesothosaurus relationship to nanti.Lesothosaurus ornithischians evolved in what is now South Africa in the early Jurassic period , 200 million years ago . It gets its name from the African country Lesotho , where fossils of early life terungkap.Gaya Lesothosaurus has been compared to modern deer , which browse on low-growing vegetation and nervously scan their environment for danger , fled when approached too dekat.Lesothosaurus predators have a small head with very large eyes , short front legs with grasping hands , and body and tail extends about three feet ( one meter ) long . Jaws lined with small , jagged teeth for shredding plants and , like most ornithischians , his mouth was tipped with a pointed beak . Long , muscular legs , hollow bones , and clawed feet will allow the light to outsprint dinosaur or predator.Lesothosaurus outperform most likely died by mid- Jurassic , but later ornithischians thrived for 150 million years until the extinction of the dinosaurs 65 million years ago .Food : HerbivoresSize 3.3 ft ( 1 m )Protection status : Extinct \Did you ? : Lesothosaurus gets its name from the African country Lesotho .
4 . Mononykus Olecranus
Mononykus olecranus is rather strange dinosaur that has puzzled scientists and refused classification Mononykus definitif.Fitur most typical is a pair of short , stunted forelimbs , which each have only one functional fingers and claws . This peculiar physiology short limbs has spawned several competing hypotheses about the behavior of ancient animals itu.Orientasi small limbs ' may have made them useless for grabbing prey or dig burrows . They may have been used to dig a nest of insects or plants to divide pencernaan.Tetapi some scientists believe that the weapons are not normally used to connect and pull the ants from their nests in much the same way used by some modern anteaters or armadillos . This animal also has elongated claws and single digits . It would be rather unusual behavior for most of the other dinosaurs as either vegetarian or predator tangguh.Masih confirmed other researchers have suggested that Mononykus bird not a dinosaur at all but rather , an ancient flying birds . This interpretation arises because the keel , or ridge , which runs on the sternum animals , like those found in manyFood : CarnivoresSize : 3 ft ( 1 m )Protection status : ExtinctDid you ? : Muscular Mononykus elbow revealed that the short arm is very strong .
5 . Pachycephalosaurus Wyomingensis
Wyomingensis Pachycephalosaurus is the largest of pachycephalosaurids - " thick -headed dinosaur " - which features a very thick beanie . The top of the skull of Pachycephalosaurus be 9 inches ( 23 cm ) thick , and a lot of skull and muzzle are also covered by a small bony knobs and spikes . Typical dinosaur skull vault was so stout that sometimes survive as fossils when skeletal remains degradasi.Beberapa scientists have postulated that the soft skull of Pachycephalosaurus that allows the animals to engage in head - butting battles dominance may be associated with mating , such as bighorn sheep and animals other modern done . Scars on fossil remains have been interpreted as strengthening this hypothesis , although other studies contradict . Cervical vertebrae of dinosaurs may not have been strong enough to survive the crash without melanggar.Kubah Pachycephalosaurus it , such as large antlers and horns of some modern animals , may have provided candidates with a strong visual cues of strength reproduksi.Pachycephalosaurus may eat the plants of lowland relative close to the ground .Food : HerbivoresSize : 9 ft ( 3 m ) , 250 pounds ( 115 kg )Protection status : ExtinctDid you ? : This species is known only by the skull - there material complete skeleton ever documented .
6 . Ankylosaurus Magniventris
This is a prehistoric dinosaur tank their time . Ankylosaurus magniventris covered with hard , bony plates that offer exceptional protection from the most formidable predator - T . rex . Row of spikes running along the body Anklyosaurus , and small horns adorning his head to complete array mengesankan.Predator defense will have to flip a squat , four-legged animals above , shows unprotected belly , to find the point of a typical lemah.Piring Ankylosaurus that no more than parry a blow - they can also be used as a weapon . At the tail end of the animal , a series of plates fused together and held aloft by the tail vertebrae fused together . This tail clublike likely delivered a powerful punch and served as a serious deterrent to potential predator.Ankylosaurus have small teeth and a beak , which is used to browse a large number of plants needed to maintain the body three to four tons . Magniventris Ankylosaurus was the largest and heaviest of ankylosaurid and some species grow up to 33 feet ( 10 meters ) .Food : HerbivoresSize : 25-35 ft ( 7,5 - 10,5 m )Protection status : ExtinctDid You Know ? : Ankylosaurus had small brains relative to the size and probably not very smart .
7 . Brachychampsa Montana
between alligatoroids very early known to science . Brachychampsa first fossil was found in the Hell Creek Formation in Montana - suite which was laid in the ancient rocks near the end of the Cretaceous period . Individual animals that live not so long before the Cretaceous - Tertiary extinction that wiped out many species of earth about 65 million years lalu.Brachychampsa have short teeth and a large mouth that packed more power than crocodiles live . These characteristics suggest that oral Brachychampsa may have preyed on turtles, which are very common in the Hell Creek fauna.Buaya ancestors first evolved some 245 million years ago . About 80 million years ago , during the Cretaceous period , crocodile appeared . This group includes such alligatoroids Brachychampsa crocodiles and their close relatives and Caiman.Banyak of ancient animals that survived the Cretaceous - Tertiary extinction , although no one knows why they lived when so many others modern tewas.Buaya still closely related to their ancestors and look much like their relatives 80 million years ago .Food : CarnivoresSize : 8-10 feet ( 2.5 to 3 m )Protection status : ExtinctDid you ? : Crocodile modern look the same as their ancestors 80 - million - year .
8 . Cretoxyrhina Mantelli
Cretoxyrhina is one of the biggest sharks and a formidable predator in the Late Cretaceous sea . Ginsu shark nicknamed after a kitchen knife that slices and dices , Cretoxyrhina dismantle its prey with a mouth full of sharp , bone - shearing teeth . Evidence suggests Cretoxyrhina feeding on mosasaurs , plesiosaurs , and even giant bony fish Xiphactinus , a fierce predator that sendiri.Hiu made of cartilage , which does not fossilize well . Much of what is known about them comes from their more abundant hard - and - gear . Cretoxyrhina the smooth , curved , and grow more than two inches ( five centimeters ) long . Teeth marks embedded in the bones and teeth suggest Cretoxyrhina chew their prey with strength brutal.Perkiraan from the remnants of calcified cartilage Ginsu some suggest they grow upwards of 24 feet ( 7 meters ) long , similar in size to modern white sharks are large . Although the fierce and feared , Cretoxyrhina been devoured by a giant mosasaur Tylosaurus , and Ginsu remains the scavenged by sharks smaller than time , SqualicoraFood : CarnivoresSize : 24 ft ( 7 m )Protection status : ExtinctDid you ? : Fossil teeth show signs Cretoxyrhina and Squalicorax sharks go after the same meal , good hunting together or steal from each other
.8 . Devil Frog
Beelzebufo ampinga , called " devil frog , " may be the largest frog that ever lived . This beach - ball sized amphibian , now extinct , grow to 16 inches ( 41 cm ) in length and weigh about 10 pounds ( 4.5 kilograms ) . They inhabit the island of Madagascar during the Late Cretaceous , about 65 to 70 million years lalu.Ini mostly terrestrial frogs may be as angry and aggressive as their living relatives , ceratophyrines of South America , the scientists said . Ceratophyrines nasty sit - and - wait predators that want to snap anything that happens by , the experts noted . Ancient devil frog might have snatched lizards , small vertebrates , and perhaps even hatchling dinosaurs with a large mouth and jaw kuat.Para Beelzebufo scientists announced in February 2008 more than a decade after the first bit of the fossil species found . Its name comes from Beelzebub , Greek for " the devil , " and bufo , Latin for toad . Ampinga means " armored , " describes the shield skull has prominent species in kepalanya.Kehadiran Beelzebufo in Madagascar for biogeographers raises an important question : How is it that the modern relatives of the giant frog is only found in parts of the world in South America ? Most scientists think Madagascar separated from Africa about 160 million years ago during the breakup of the supercontinent Gondwana , and then break away from India and became an isolated island about 88 million years ago . But Beelzebufo Madagascar and other fossils that have characteristics of South America showing land connection between South America , Madagascar , Antarctica , and perhaps may have been there as late 65-70000000 years ago .Food : CarnivoresSize : 16 in. ( 41 cm )Protection status : ExtinctWeight : 10 pounds ( 4.5 kg )Did you ? : Ceratophyrines , descent living frogs devils , sometimes called " Pac - Man frog , " because its shape resembles a rounded and oversized mouth old video game character .
9 . Hesperornis Regalis
Hesperornis is a large flightless birds that swim in the ocean and fish entangled with part- plated teeth . Small wings are held close to the body and use a little beyond that may help steer through the water . Instead , rely Hesperornis strong hind legs and webbed feet to catch prey and escape predators in the Cretaceous sea . A flattened tail may have helped change the depth of the bird and underwater arah.Bahkan , Hesperornis so adapted to diving and swimming are walking on land is awkward proposition at best . Presumably , birds just ventured into solid ground to breed and lay eggs . Either water or soil that is safe for Hesperornis : Dinosaurs threats land , and water Tylosaurus giant mosasaur known to consider Hesperornis lezat.Pada food water , a long , slender neck gave Hesperornis silhouette similar to a modern grebe . May eat and grew up as a penguin .Food : CarnivoresUkurang : Length, Up With 5 feet ( 1.5 m )Protection status : ExtinctDid you ? : Most of the fossils Hesperornis known from Canada , a proof of an ancient bird preference for cooler waters in the northern latitudes .
10 . Henodus Chelyops
Henodus are reptiles ( one meter long ) marine three - foot - long called placodont shattered lives under the shell with two teeth behind his muzzle beaklike . Snout was squared off just in front of the eye , making regular boxy head . The ancient placodont looks like a turtle flat , although the protective shell of bony plates twice as long as wide and relatively flat .Four paddle - like limbs and a short tail to allow Henodus crept along the floor of a shallow , brackish lagoon in Europe during the Triassic period , about 228 million to 200 million years ago . Weak limbs likely made walking on land difficult , but Henodus is breath of air and amphibious - probably back to shore to rest , breed , and perhaps shelter from predators water .Food : CarnivoresUkurang : Length , Waste to 3 ft ( 1 m )Protection status : ExtinctDid you ? : Henodus , the only one known to have been inhabited placodont non - marine environments , live in brackish , possibly freshwater , lagoon
11 . Ammonite
Amon is a predator , a creature that lives in squidlike coil - shaped shells . Like other squid , ammonites have sharp jaws in the ring beaklike tentacles that extended from their shells to catch prey such as small fish and crustaceans . Some ammonites grow more than three feet ( one meter ) in - probability snack for giant mosasaur Tylosaurus.Amon continue to be built a new shell as they grow , but only live in outer space . They shuffled through the warm , shallow sea with spray jets of water from their bodies . A thin , tubelike structure called a siphuncle reached into the interior space to pump and suck the air and help them move through air.Amon first appeared about 240 million years ago , although they come from a straight shelled squid called bacrites that date back to the Devonian , about 415 million years ago . Amon is a prolific breeder , stay in school , and among the most commonly found fossils today . They became extinct with the dinosaurs 65 million years ago . The scientists use a variety of shapes and sizes Amon shells appeared and disappeared over the centuries until other fossils .Food : CarnivoresSize : Some more than 3 feet , ( 1 m ) in diameterGroup name : SchoolProtection status : ExtinctDid you ? : Ammonites women grow up to 400 percent larger than males , perhaps to make room for the spawn .
12 . Dolichorhynchops Osborni
Dolichorhynchops is a short -necked plesiosaur that used long , paddle like flippers to fly through the water like a penguin . Marine reptiles are underwater acrobatics quick and agile , with large eyes well adjusted to spy small prey . Long , narrow jaws filled with sharp teeth 30 to 40 in a row allows Dolichorhynchops to take the prey but does not cut it . Instead , fish are caught and then swallowed utuh.Dolichorhynchops grows 12 to 15 feet ( 4 to 5 meters ) long and probably covered in smooth leather . Winglike paddles Its built almost one hundred dense bones , making them too stiff for use on land , but very good for a quick swim . Although the creature may have been able to dive deep in search of prey , the need to breathe air means most of the time they spent in the near surface air.The short-necked plesiosaur may have some enemies , but they were attacked was some fierce monsters of the sea , including a shark with teeth sharp and giant mosasaur Tylosaurus . One famous fossil Tylosaurus contains remnants Dolichorhynchops adolescents . And Dolichorhynchops fossils have been found with the unborn baby inside , strong evidence they give birth to live young .Food : CarnivoresSize : Up to 15 feet ( 4.6 m )Protection status : ExtinctDo you know ? : Modern Mammals , including humans and giraffes , have seven neck bones . Dolichorhynchops has more than 20 .13 . Protostega gigas
Grow more than 10 feet ( 3 meters ) long , Protostega is one the largest turtle that ever lived . Unlike
most turtles , shells made of expanded and fused bones that form a
relatively solid dome , bone much space that looks more like a raised
roof rafters Protostega the rough shell . Although
shell design provides less protection , lighter weight combined with
strong front legs like making Protostega a fin , a strong swimmer
inexhaustible . Women
tend to migrate hundreds of miles to lay eggs on the sandy beaches ,
such as sea turtles do today ini.Gerakan land , however , is difficult .
Protostega an adult female can weigh a ton or more , a hefty load to drag out of the sea to spawn . But
they do lay eggs on the beach by the dozens , safety in numbers
reproductive strategy that helps at least some survive to adulthood . In
fact , the sea turtle is the only reptile sailing at sea to avoid
extinction at the end of the Cretaceous , 65 million years lalu.Seorang
big head and pointed with sharp beak and strong jaws may help ancient
turtle eating a slow moving sea creatures like jellyfish jellyfish and shellfish and seaweed and floating bodies of their offspring as much to do today . Shark tooth embedded in bone Protostega housed in a museum in Chicago shows turtles sometimes eat their own .Food : The OmnivoreSize : Length , 10 ft ( 3 m )Protection status : ExtinctDid you ? : Many specimens Protostega less leg and skull , suggests that their remains scavenged by sharks and other predators .14 . Protosphyraena
Protosphyraena is a medium-size fish predator of Late Cretaceous sea with a long snout and teeth bladelike swordlike positioned to impale their prey escape . What's more , one of the ancient fish have long , pectoral fin bones with serrated edges like a saw blade leading . While the exact purpose of the fins is a matter of scientific debate sawlike , no doubt the fish is armed with many weapons potentially ofensif.Sepenuhnya Protosphyraena grown an average of between six and nine feet ( two and three meters ) long , mediocre stature in ocean mosasaurs and plesiosaurs ruled by growing more than 35 feet ( 11 meters ) . Protosphyraena rarely complete framework , which might indicate that either they or a scavenger devouring corpses floated because they rot and fall apart . As some Late Cretaceous sea monsters , Protosphyraenamost likely extinct 65 million years ago .Food : carnivoreSize : Length , 8 ft ( 2.4 m )Protection status : Extinct
1 . Tyrannosaurus
Tyrannosaurus rex was one of the largest meat-eating dinosaurs that ever lived . Everything about this ferocious predator , from the thick , heavy skull to ( 1.2 meters long ) jaw 4 - foot - long , designed for maximum action - menghancurkan.Bukti bone fossil shows that Tyrannosaurus was about 40 feet ( 12 meters ) and length approximately 15 to 20 feet ( 4.6 to 6 meters ) high . Strong thighs and long , powerful tail helped it move quickly , and the 5 - foot - long ( 1.5 meters long ) skull could give birth to a very large mangsanya.T . rex serrated , conical teeth were most likely used to pierce and grip flesh , which then ripped with muscles muscular neck . Two finger sleeves that might seize their prey , but they are too short to reach mulutnya.Para Scientists believe this powerful predator could eat up to 500 pounds ( 230 kilograms ) of meat in one bite . Fossils of T. rex prey , including Triceratops and Edmontosaurus , suggest T. rex crushed and broken bones such as eating , and fractures have been found in kotorannya.Tyrannosaurus rex lived in forested river valleys in North America during the late Cretaceous period . It became extinct about 65 million years ago in the Cretaceous - Tertiary mass extinction .types : prehistoric diet : carnivorous Size : 40 ft ( 12 m ) long , 15 to 20 ft ( 4.6 to 6 m ) Protection Status : endangered Meaning From : Tyrannosaurus means " tyrant lizard . "
2 . Xiphactinus Audax
Xiphactinus is one of the largest bony fish of the Cretaceous and is considered one of the fiercest creatures in the sea . A powerful tail and winglike pectoral fins shot 17 - foot - long ( 5 meters long ) monster through the surface of the sea water . Fish and unsuspecting seabirds were snared in Malang reverse Xiphactinus jaw , which is lined with giant , fanglike teeth , giving an expression similar to that of bulldog.A 13 - foot - long ( 4 - meter-long ) Xiphactinus can open wide enough to swallow a six - foot - long ( two- meter-long ) fish around the jaw , but it itself is sometimes prey Cretoxyrhina controlled hiu.Xiphactinus ancient ocean called the Western Interior Seaway , which covered much of central North America during the Cretaceous . Although long extinct , if alive today the bony fish would look like a giant , fanged tarpon .Food : CarnivoresSize : Length up to 17 ft ( 5 m )Protection status : ExtinctDid you ? : A Xiphactinus on display in a museum in Kansas have a complete , well-preserved fish in it . Scientists believe that the struggling prey ruptured organs such as the ingested captors , killing the larger fish .3 . Lesothosaurus Diagnosticus
Lesothosaurus ornithischians diagnosticus is one of the earliest and most primitive , or " bird - hipped " dinosaurs . Ornithischians is one of two major groups of dinosaurs and include familiar species such as armored Stegosaurus and Ankylosaurus and Triceratops horns tiga.Lesothosaurus small , nimble , and bipedal , apparently bearing little resemblance to a giant , four-legged ornithischians that came later . But physical characteristics , such as hip and jaw structure and teeth are designed for chewing plants , Lesothosaurus relationship to nanti.Lesothosaurus ornithischians evolved in what is now South Africa in the early Jurassic period , 200 million years ago . It gets its name from the African country Lesotho , where fossils of early life terungkap.Gaya Lesothosaurus has been compared to modern deer , which browse on low-growing vegetation and nervously scan their environment for danger , fled when approached too dekat.Lesothosaurus predators have a small head with very large eyes , short front legs with grasping hands , and body and tail extends about three feet ( one meter ) long . Jaws lined with small , jagged teeth for shredding plants and , like most ornithischians , his mouth was tipped with a pointed beak . Long , muscular legs , hollow bones , and clawed feet will allow the light to outsprint dinosaur or predator.Lesothosaurus outperform most likely died by mid- Jurassic , but later ornithischians thrived for 150 million years until the extinction of the dinosaurs 65 million years ago .Food : HerbivoresSize 3.3 ft ( 1 m )Protection status : Extinct \Did you ? : Lesothosaurus gets its name from the African country Lesotho .
4 . Mononykus Olecranus
Mononykus olecranus is rather strange dinosaur that has puzzled scientists and refused classification Mononykus definitif.Fitur most typical is a pair of short , stunted forelimbs , which each have only one functional fingers and claws . This peculiar physiology short limbs has spawned several competing hypotheses about the behavior of ancient animals itu.Orientasi small limbs ' may have made them useless for grabbing prey or dig burrows . They may have been used to dig a nest of insects or plants to divide pencernaan.Tetapi some scientists believe that the weapons are not normally used to connect and pull the ants from their nests in much the same way used by some modern anteaters or armadillos . This animal also has elongated claws and single digits . It would be rather unusual behavior for most of the other dinosaurs as either vegetarian or predator tangguh.Masih confirmed other researchers have suggested that Mononykus bird not a dinosaur at all but rather , an ancient flying birds . This interpretation arises because the keel , or ridge , which runs on the sternum animals , like those found in manyFood : CarnivoresSize : 3 ft ( 1 m )Protection status : ExtinctDid you ? : Muscular Mononykus elbow revealed that the short arm is very strong .
5 . Pachycephalosaurus Wyomingensis
Wyomingensis Pachycephalosaurus is the largest of pachycephalosaurids - " thick -headed dinosaur " - which features a very thick beanie . The top of the skull of Pachycephalosaurus be 9 inches ( 23 cm ) thick , and a lot of skull and muzzle are also covered by a small bony knobs and spikes . Typical dinosaur skull vault was so stout that sometimes survive as fossils when skeletal remains degradasi.Beberapa scientists have postulated that the soft skull of Pachycephalosaurus that allows the animals to engage in head - butting battles dominance may be associated with mating , such as bighorn sheep and animals other modern done . Scars on fossil remains have been interpreted as strengthening this hypothesis , although other studies contradict . Cervical vertebrae of dinosaurs may not have been strong enough to survive the crash without melanggar.Kubah Pachycephalosaurus it , such as large antlers and horns of some modern animals , may have provided candidates with a strong visual cues of strength reproduksi.Pachycephalosaurus may eat the plants of lowland relative close to the ground .Food : HerbivoresSize : 9 ft ( 3 m ) , 250 pounds ( 115 kg )Protection status : ExtinctDid you ? : This species is known only by the skull - there material complete skeleton ever documented .
6 . Ankylosaurus Magniventris
This is a prehistoric dinosaur tank their time . Ankylosaurus magniventris covered with hard , bony plates that offer exceptional protection from the most formidable predator - T . rex . Row of spikes running along the body Anklyosaurus , and small horns adorning his head to complete array mengesankan.Predator defense will have to flip a squat , four-legged animals above , shows unprotected belly , to find the point of a typical lemah.Piring Ankylosaurus that no more than parry a blow - they can also be used as a weapon . At the tail end of the animal , a series of plates fused together and held aloft by the tail vertebrae fused together . This tail clublike likely delivered a powerful punch and served as a serious deterrent to potential predator.Ankylosaurus have small teeth and a beak , which is used to browse a large number of plants needed to maintain the body three to four tons . Magniventris Ankylosaurus was the largest and heaviest of ankylosaurid and some species grow up to 33 feet ( 10 meters ) .Food : HerbivoresSize : 25-35 ft ( 7,5 - 10,5 m )Protection status : ExtinctDid You Know ? : Ankylosaurus had small brains relative to the size and probably not very smart .
7 . Brachychampsa Montana
between alligatoroids very early known to science . Brachychampsa first fossil was found in the Hell Creek Formation in Montana - suite which was laid in the ancient rocks near the end of the Cretaceous period . Individual animals that live not so long before the Cretaceous - Tertiary extinction that wiped out many species of earth about 65 million years lalu.Brachychampsa have short teeth and a large mouth that packed more power than crocodiles live . These characteristics suggest that oral Brachychampsa may have preyed on turtles, which are very common in the Hell Creek fauna.Buaya ancestors first evolved some 245 million years ago . About 80 million years ago , during the Cretaceous period , crocodile appeared . This group includes such alligatoroids Brachychampsa crocodiles and their close relatives and Caiman.Banyak of ancient animals that survived the Cretaceous - Tertiary extinction , although no one knows why they lived when so many others modern tewas.Buaya still closely related to their ancestors and look much like their relatives 80 million years ago .Food : CarnivoresSize : 8-10 feet ( 2.5 to 3 m )Protection status : ExtinctDid you ? : Crocodile modern look the same as their ancestors 80 - million - year .
8 . Cretoxyrhina Mantelli
Cretoxyrhina is one of the biggest sharks and a formidable predator in the Late Cretaceous sea . Ginsu shark nicknamed after a kitchen knife that slices and dices , Cretoxyrhina dismantle its prey with a mouth full of sharp , bone - shearing teeth . Evidence suggests Cretoxyrhina feeding on mosasaurs , plesiosaurs , and even giant bony fish Xiphactinus , a fierce predator that sendiri.Hiu made of cartilage , which does not fossilize well . Much of what is known about them comes from their more abundant hard - and - gear . Cretoxyrhina the smooth , curved , and grow more than two inches ( five centimeters ) long . Teeth marks embedded in the bones and teeth suggest Cretoxyrhina chew their prey with strength brutal.Perkiraan from the remnants of calcified cartilage Ginsu some suggest they grow upwards of 24 feet ( 7 meters ) long , similar in size to modern white sharks are large . Although the fierce and feared , Cretoxyrhina been devoured by a giant mosasaur Tylosaurus , and Ginsu remains the scavenged by sharks smaller than time , SqualicoraFood : CarnivoresSize : 24 ft ( 7 m )Protection status : ExtinctDid you ? : Fossil teeth show signs Cretoxyrhina and Squalicorax sharks go after the same meal , good hunting together or steal from each other
.8 . Devil Frog
Beelzebufo ampinga , called " devil frog , " may be the largest frog that ever lived . This beach - ball sized amphibian , now extinct , grow to 16 inches ( 41 cm ) in length and weigh about 10 pounds ( 4.5 kilograms ) . They inhabit the island of Madagascar during the Late Cretaceous , about 65 to 70 million years lalu.Ini mostly terrestrial frogs may be as angry and aggressive as their living relatives , ceratophyrines of South America , the scientists said . Ceratophyrines nasty sit - and - wait predators that want to snap anything that happens by , the experts noted . Ancient devil frog might have snatched lizards , small vertebrates , and perhaps even hatchling dinosaurs with a large mouth and jaw kuat.Para Beelzebufo scientists announced in February 2008 more than a decade after the first bit of the fossil species found . Its name comes from Beelzebub , Greek for " the devil , " and bufo , Latin for toad . Ampinga means " armored , " describes the shield skull has prominent species in kepalanya.Kehadiran Beelzebufo in Madagascar for biogeographers raises an important question : How is it that the modern relatives of the giant frog is only found in parts of the world in South America ? Most scientists think Madagascar separated from Africa about 160 million years ago during the breakup of the supercontinent Gondwana , and then break away from India and became an isolated island about 88 million years ago . But Beelzebufo Madagascar and other fossils that have characteristics of South America showing land connection between South America , Madagascar , Antarctica , and perhaps may have been there as late 65-70000000 years ago .Food : CarnivoresSize : 16 in. ( 41 cm )Protection status : ExtinctWeight : 10 pounds ( 4.5 kg )Did you ? : Ceratophyrines , descent living frogs devils , sometimes called " Pac - Man frog , " because its shape resembles a rounded and oversized mouth old video game character .
9 . Hesperornis Regalis
Hesperornis is a large flightless birds that swim in the ocean and fish entangled with part- plated teeth . Small wings are held close to the body and use a little beyond that may help steer through the water . Instead , rely Hesperornis strong hind legs and webbed feet to catch prey and escape predators in the Cretaceous sea . A flattened tail may have helped change the depth of the bird and underwater arah.Bahkan , Hesperornis so adapted to diving and swimming are walking on land is awkward proposition at best . Presumably , birds just ventured into solid ground to breed and lay eggs . Either water or soil that is safe for Hesperornis : Dinosaurs threats land , and water Tylosaurus giant mosasaur known to consider Hesperornis lezat.Pada food water , a long , slender neck gave Hesperornis silhouette similar to a modern grebe . May eat and grew up as a penguin .Food : CarnivoresUkurang : Length, Up With 5 feet ( 1.5 m )Protection status : ExtinctDid you ? : Most of the fossils Hesperornis known from Canada , a proof of an ancient bird preference for cooler waters in the northern latitudes .
10 . Henodus Chelyops
Henodus are reptiles ( one meter long ) marine three - foot - long called placodont shattered lives under the shell with two teeth behind his muzzle beaklike . Snout was squared off just in front of the eye , making regular boxy head . The ancient placodont looks like a turtle flat , although the protective shell of bony plates twice as long as wide and relatively flat .Four paddle - like limbs and a short tail to allow Henodus crept along the floor of a shallow , brackish lagoon in Europe during the Triassic period , about 228 million to 200 million years ago . Weak limbs likely made walking on land difficult , but Henodus is breath of air and amphibious - probably back to shore to rest , breed , and perhaps shelter from predators water .Food : CarnivoresUkurang : Length , Waste to 3 ft ( 1 m )Protection status : ExtinctDid you ? : Henodus , the only one known to have been inhabited placodont non - marine environments , live in brackish , possibly freshwater , lagoon
11 . Ammonite
Amon is a predator , a creature that lives in squidlike coil - shaped shells . Like other squid , ammonites have sharp jaws in the ring beaklike tentacles that extended from their shells to catch prey such as small fish and crustaceans . Some ammonites grow more than three feet ( one meter ) in - probability snack for giant mosasaur Tylosaurus.Amon continue to be built a new shell as they grow , but only live in outer space . They shuffled through the warm , shallow sea with spray jets of water from their bodies . A thin , tubelike structure called a siphuncle reached into the interior space to pump and suck the air and help them move through air.Amon first appeared about 240 million years ago , although they come from a straight shelled squid called bacrites that date back to the Devonian , about 415 million years ago . Amon is a prolific breeder , stay in school , and among the most commonly found fossils today . They became extinct with the dinosaurs 65 million years ago . The scientists use a variety of shapes and sizes Amon shells appeared and disappeared over the centuries until other fossils .Food : CarnivoresSize : Some more than 3 feet , ( 1 m ) in diameterGroup name : SchoolProtection status : ExtinctDid you ? : Ammonites women grow up to 400 percent larger than males , perhaps to make room for the spawn .
12 . Dolichorhynchops Osborni
Dolichorhynchops is a short -necked plesiosaur that used long , paddle like flippers to fly through the water like a penguin . Marine reptiles are underwater acrobatics quick and agile , with large eyes well adjusted to spy small prey . Long , narrow jaws filled with sharp teeth 30 to 40 in a row allows Dolichorhynchops to take the prey but does not cut it . Instead , fish are caught and then swallowed utuh.Dolichorhynchops grows 12 to 15 feet ( 4 to 5 meters ) long and probably covered in smooth leather . Winglike paddles Its built almost one hundred dense bones , making them too stiff for use on land , but very good for a quick swim . Although the creature may have been able to dive deep in search of prey , the need to breathe air means most of the time they spent in the near surface air.The short-necked plesiosaur may have some enemies , but they were attacked was some fierce monsters of the sea , including a shark with teeth sharp and giant mosasaur Tylosaurus . One famous fossil Tylosaurus contains remnants Dolichorhynchops adolescents . And Dolichorhynchops fossils have been found with the unborn baby inside , strong evidence they give birth to live young .Food : CarnivoresSize : Up to 15 feet ( 4.6 m )Protection status : ExtinctDo you know ? : Modern Mammals , including humans and giraffes , have seven neck bones . Dolichorhynchops has more than 20 .13 . Protostega gigas
Grow more than 10 feet ( 3 meters ) long , Protostega is one the largest turtle that ever lived . Unlike
most turtles , shells made of expanded and fused bones that form a
relatively solid dome , bone much space that looks more like a raised
roof rafters Protostega the rough shell . Although
shell design provides less protection , lighter weight combined with
strong front legs like making Protostega a fin , a strong swimmer
inexhaustible . Women
tend to migrate hundreds of miles to lay eggs on the sandy beaches ,
such as sea turtles do today ini.Gerakan land , however , is difficult .
Protostega an adult female can weigh a ton or more , a hefty load to drag out of the sea to spawn . But
they do lay eggs on the beach by the dozens , safety in numbers
reproductive strategy that helps at least some survive to adulthood . In
fact , the sea turtle is the only reptile sailing at sea to avoid
extinction at the end of the Cretaceous , 65 million years lalu.Seorang
big head and pointed with sharp beak and strong jaws may help ancient
turtle eating a slow moving sea creatures like jellyfish jellyfish and shellfish and seaweed and floating bodies of their offspring as much to do today . Shark tooth embedded in bone Protostega housed in a museum in Chicago shows turtles sometimes eat their own .Food : The OmnivoreSize : Length , 10 ft ( 3 m )Protection status : ExtinctDid you ? : Many specimens Protostega less leg and skull , suggests that their remains scavenged by sharks and other predators .14 . Protosphyraena Protosphyraena is a medium-size fish predator of Late Cretaceous sea with a long snout and teeth bladelike swordlike positioned to impale their prey escape . What's more , one of the ancient fish have long , pectoral fin bones with serrated edges like a saw blade leading . While the exact purpose of the fins is a matter of scientific debate sawlike , no doubt the fish is armed with many weapons potentially ofensif.Sepenuhnya Protosphyraena grown an average of between six and nine feet ( two and three meters ) long , mediocre stature in ocean mosasaurs and plesiosaurs ruled by growing more than 35 feet ( 11 meters ) . Protosphyraena rarely complete framework , which might indicate that either they or a scavenger devouring corpses floated because they rot and fall apart . As some Late Cretaceous sea monsters , Protosphyraenamost likely extinct 65 million years ago .Food : carnivoreSize : Length , 8 ft ( 2.4 m )Protection status : Extinct
