Extinct Animals: Saurischian Dinosaurs  The Saurischian or lizard-hipped dinosaurs were much larger the bird-hipped dinosaurs.

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Extinct Animals: Saurischian Dinosaurs  The Saurischian or lizard-hipped dinosaurs were much larger the bird-hipped dinosaurs.

Extinct Animals: Saurischian Dinosaurs  The Saurischian or lizard-hipped dinosaurs were much larger the bird-hipped dinosaurs.  Sauropods were among the largest lizard-hipped dinosaurs.

Extinct Animals: Saurischian Dinosaurs  The Saurischian or lizard-hipped dinosaurs were much larger the bird-hipped dinosaurs.  Sauropods were among the largest lizard-hipped dinosaurs.  One sauropod, Seismosaur, achieved a length of 140 feet, making it the largest land vertebrate that walked on Earth.

Extinct Animals: Saurischian Dinosaurs  About 150 species have been identified.

Extinct Animals: Saurischian Dinosaurs  About 150 species have been identified.  Theropods were another group of lizard-hipped dinosaurs.

Extinct Animals: Saurischian Dinosaurs  About 150 species have been identified.  Theropods were another group of lizard-hipped dinosaurs.  Most of these animals ate meat.

Extinct Animals: Saurischian Dinosaurs  About 150 species have been identified.  Theropods were another group of lizard-hipped dinosaurs.  Most of these animals ate meat.  All had long tails that were thoughts to have been used for balance.

Extinct Animals: Saurischian Dinosaurs  About 150 species have been identified.  Theropods were another group of lizard-hipped dinosaurs.  Most of these animals ate meat.  All had long tails that were thoughts to have been used for balance.  Theropods are believed to have walked on their strong hind legs and use their front limbs for grasping.

Extinct Animals: Saurischian Dinosaurs  Theropods included the enormous tyrannosaurs as well as the relatively small but ferocious raptors.

Extinct Animals: Saurischian Dinosaurs  Theropods included the enormous tyrannosaurs as well as the relatively small but ferocious raptors.  They were not all giants, including the turkey sized Compsognathus, which was one of the smallest dinosaur known, and a diverse group of medium-sized cousins.

Extinct Animals: Marine Reptiles & Pterosaurs  Long-necked marine reptiles called plesiosaurs also appear in the Mesozoic layers.

Extinct Animals: Marine Reptiles & Pterosaurs  Long-necked marine reptiles called plesiosaurs also appear in the Mesozoic layers.  At 50 ft. long, they were as long a 5-story building.

Extinct Animals: Marine Reptiles & Pterosaurs  Long-necked marine reptiles called plesiosaurs also appear in the Mesozoic layers.  At 50 ft. long, they were as long a 5-story building.  Ichthyosaurs were even longer, up to 70 ft. long.

Extinct Animals: Marine Reptiles & Pterosaurs  Long-necked marine reptiles called plesiosaurs also appear in the Mesozoic layers.  At 50 ft. long, they were as long a 5-story building.  Ichthyosaurs were even longer, up to 70 ft. long.  Flying reptiles called pterosaurs flew in the skies above them

Extinct Animals: Marine Reptiles & Pterosaurs  Long-necked marine reptiles called plesiosaurs also appear in the Mesozoic layers.  At 50 ft. long, they were as long a 5-story building.  Ichthyosaurs were even longer, up to 70 ft. long.  Flying reptiles called pterosaurs flew in the skies above them  Some were no longer than a sparrow, while others were the size of an airplane with a wingspan of up to 40 ft.

Extinct Animals: Marine Reptiles & Pterosaurs  Marine reptiles have frequently, and erroneously, been called dinosaurs.

Extinct Animals: Marine Reptiles & Pterosaurs  Marine reptiles have frequently, and erroneously, been called dinosaurs.  Though they have been found in the same part of the geologic column, they differed from dinosaurs in several important details.

Extinct Animals: Marine Reptiles & Pterosaurs  Marine reptiles have frequently, and erroneously, been called dinosaurs.  Though they have been found in the same part of the geologic column, they differed from dinosaurs in several important details.  No marine reptile had a skeleton with a hip bone shaped like either of the main groups of dinosaurs, and their limbs were modified flippers or paddled, somewhat similar to fins of marine mammals today.

Extinct Animals: Marine Reptiles & Pterosaurs  Pterosaurs are not considered dinosaurs either.

Extinct Animals: Marine Reptiles & Pterosaurs  Pterosaurs are not considered dinosaurs either.  They had hollow lightweight bones, long necks, short bodies, and forelimbs that took the form of wings.

Extinct Animals: Marine Reptiles & Pterosaurs  Pterosaurs are not considered dinosaurs either.  They had hollow lightweight bones, long necks, short bodies, and forelimbs that took the form of wings.  Their wings were featherless and made of a skin membrane similar to the wings of a bat.

Extinct Animals: Marine Reptiles & Pterosaurs  Pterosaurs are not considered dinosaurs either.  They had hollow lightweight bones, long necks, short bodies, and forelimbs that took the form of wings.  Their wings were featherless and made of a skin membrane similar to the wings of a bat.  Whether they flew by flapping their wings or gliding though the air is uncertain.

Extinct Animals: Marine Reptiles & Pterosaurs  On the ground, pterosaurs may have walked or crawled, or they have have been bipedal, walking on only their hind limbs.

Extinct Animals: Megafauna  Another group of extinct animals, called the Megafauna, included large animals that lived during the Cenozoic Era.

Extinct Animals: Megafauna  Another group of extinct animals, called the Megafauna, included large animals that lived during the Cenozoic Era.  This group of animals included mammals, birds, and reptiles.

Extinct Animals: Megafauna  Birds called moa were nearly twice as tall as an average human.

Extinct Animals: Megafauna  Birds called moa were nearly twice as tall as an average human.  Although they could not fly, fossilized footprints suggest that moa could walk up to 3mi/h.

Extinct Animals: Megafauna  Birds called moa were nearly twice as tall as an average human.  Although they could not fly, fossilized footprints suggest that moa could walk up to 3mi/h.  Another flightless giant bird belonged to the Aepyornis species.

Extinct Animals: Megafauna  Birds called moa were nearly twice as tall as an average human.  Although they could not fly, fossilized footprints suggest that moa could walk up to 3mi/h.  Another flightless giant bird belonged to the Aepyornis species.  This birds were more than 10 ft. tall and could have weighted nearly 1100 lbs.

Extinct Animals: Megafauna  The giant ground sloth was about the size of a black bear, but had claws that could be 20 in. long.

Extinct Animals: Megafauna  The giant ground sloth was about the size of a black bear, but had claws that could be 20 in. long.  These sloths did not have front teeth, but were still able to eat various types of plants, including willows and cacti.

Extinct Animals: Megafauna  Mastodons and woolly mammoths are two other Megafauna.

Extinct Animals: Megafauna  Mastodons and woolly mammoths are two other Megafauna.  Mastodons had large tusks and teeth.

Extinct Animals: Megafauna  Mastodons and woolly mammoths are two other Megafauna.  Mastodons had large tusks and teeth.  They stood about 10 ft. tall and weighted about 1200 lbs.

Extinct Animals: Megafauna  Woolly mammoths were much larger and probably weighted around 17,600 lbs.

Extinct Animals: Megafauna  Woolly mammoths were much larger and probably weighted around 17,600 lbs.  At the shoulder, they measured 16 ft. tall and had long, curved tusks, which were often ft. long.

Extinct Animals: Megafauna  Several extinct rodents belonged to the Megafauna.

Extinct Animals: Megafauna  Several extinct rodents belonged to the Megafauna.  Two species of giant beavers that lived in North America measured nearly 8 ft. long

Extinct Animals: Megafauna  Several extinct rodents belonged to the Megafauna.  Two species of giant beavers that lived in North America measured nearly 8 ft. long  Another mega-rodent was the North American giant capybara that lived in Florida, South Carolina, Texas, and Arizona.

Extinct Animals: Megafauna  Several extinct rodents belonged to the Megafauna.  Two species of giant beavers that lived in North America measured nearly 8 ft. long  Another mega-rodent was the North American giant capybara that lived in Florida, South Carolina, Texas, and Arizona.  Capybaras were the worlds’ largest rodents.

Extinct Animals: Megafauna  Several extinct rodents belonged to the Megafauna.  Two species of giant beavers that lived in North America measured nearly 8 ft. long  Another mega-rodent was the North American giant capybara that lived in Florida, South Carolina, Texas, and Arizona.  Capybaras were the worlds’ largest rodents.  They weighted about 200 lbs. (which is nearly twice the size of the capybaras that live today)

Extinct Animals: Megafauna  The largest animal in the Megafauna was a hornless rhinoceros called Paraceratherium.

Extinct Animals: Megafauna  The largest animal in the Megafauna was a hornless rhinoceros called Paraceratherium.  It was probably the largest mammal to have ever lived on land.

Extinct Animals: Megafauna  The largest animal in the Megafauna was a hornless rhinoceros called Paraceratherium.  It was probably the largest mammal to have ever lived on land.  Based on fossil finds, an adult could have been 18 ft. tall at the shoulders and 39 ft. long.