Modern crocodiles mostly just lounge around near river banks and wait to lunge at prey using their short, splayed legs. However, crocs that co-existed with dinosaurs did everything from stalk prey on land to ply the ancients seas.
Baurusuchus, for example, prowled the grasslands of South America on dog-like legs in the Cretaceous period, the last portion of the age of dinosaurs known as the Mesozoic era. In the earlier Triassic period, a one-foot long croc, named Erpetosuchus, may have occasionally walked on two legs.
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In the oceans, Steneosaurus lived like a dolphin, pursuing prey with it's long, toothy snout. Another sea-going croc, Stomatosuchus, had a pelican-like mouth pouch that may have allowed the croc to feed on plankton and krill like a baleen whale.
These ancient crocodiles shared the ancient world with the likes of T-rex and Megalosaurus. Despite that colossal competition, the crocs thrived in an even wider variety of environments than today. A team of veterinarians and paleontologists found one of the secret to the crocs' success in the animals' evolutionarily adaptable jaws.