Evolution of crocodiles

Meg Henderson Connor Holman Emma Staton



250,000,000 bc - 200,000,000 bc

Three feet long. 5-10lbs. Lived in the swamps of eastern Asia. Ate small animals. Sail on it's back. Split off into pre-historic crocodiles and early dinosaurs.


228,000,000 bc - 199,000,000 bc

http://t3.gstatic.com/images?q=tbn:ANd9GcRgGpvU-T90I9hMaiUGfp_ZPgov7YjZ59krdUumNsuPcr60D8pyyw Most related to crocodilians. Were herbivores, however they demonstrate the skull structure and snout. They looked much like modern day crocodiles except their nostrils were located on the top of their head rather than the tops of their snout. They were alive during the early Jurassic period.


200,000,000 bc

Bipedal. They didn't resemble modern crocodiles in behavior or body shape except the shape of their head.


110,000,000 bc

Middle Cretaceous period. 40ft long and 10-15 tons. Ate dinosaurs and fish. Lived in the rivers of Africa. Had an odd protrusion on it's snout. Looked and behaved like it's modern decedents, but it was twice as long and about 10 times as heavy. Bulla on it's snout. Also the media calls it super-croc.


100,000,000 bc - 95,000,000 bc

Really big; 36 ft. long ten tons. Ate plankton and krill even though they had a hugh pelican like jaw.


80,000,000 bc

Greek for terrible crocodile. Lived in the rivers of North America. About 33 ft long and 10 tons. They had a 6ft. long skull. Fed on fish, shell fish, and land creatures. Evidence in fossils suggests that they attacked large North American tyrannosaurs.


70,000,000 bc - 50,000,000 bc

It is five feet long, 25-50 pounds, ate fish, and lived in the rivers of North America and western Europe. It had a long narrow profile and a tooth studded snout. It survived the K/T extinction.

Cretaceous-Paleogene Extinction Event

65,000,000 bc

The K/T Extinction Event was an intense global mass extinction of Flora and Fauna which most notably included the dinosaurs. Strangely, many species of large crocodilians survived the event, evolving into the cute lovable creatures we know today.

Crocodylidae (Modern day crocodile)

55,000,000 bc - Present

The modern day crocodile, which includes the saltwater, Nile, and American variants, is spread throughout the world with various adaptions for specific climates and habitats. Though it looks prehistoric, it is a highly evolved and complex organism that is a successful predator.


23,000,000 bc - 40,000 bc

This animal was nine feet long and 500 pounds, and they consume red meat who they hunted in the woodlands. These crocodiles have long curved teeth and long legs, that are unlike the modern croc's short legs. andThe crocodiles continuously get smaller because of environment changes.

Crocodylus thorbjarnarsoni

4,200,000 bc

This is a very close relative of the modern day crocodile, it had a large scull and small raised rim in front of the eyes. It likely prayed on early humans. It lived in the Turkana basin in Kenya, and it could be the largest known true crocodile.