|Time period :||Late Cretaceous period|
|In the series|
|Brought back :||1|
Deinosuchus was a species of giant crocodilian that died out 65.5 MYA at the end of the K/T mass extinction event. Deinosuchus lurked in the rivers and seas, waiting for big prey to come, but it would also attack smaller creatures. Its prey included Parasaurolophus and its competitor is the theropod dinosaur Albertosaurus.This crocodile was the main creature for Episode 6, and was surprisingly easy to catch, considering almost every creature (as Tyrannosaurus rex and Microraptor did), took more than one attempt to capture with the exception of the Terror Bird. Nigel Marven witnessed a Deinosuchus preying on a young Parasaurolophus. He later witnesses several Deinosuchus scare-off an Albertosaurus pack from their kill and builds a trap for the giant crocodilians. Unfortunately, several Troodon steal the bait instead, so Nigel is forced to bait the trap with himself. He is successful and captures a Deinosuchus before bringing it back to Prehistoric Park. The lake for the crocodile is just at the end of the time portal so Nigel grabs a big piece of meat and takes the crocodilian to the pool.
Finally, at the end of the episode, during the mass break-out, Matilda the T. rex chases Nigel, and at one point the captured Deinosuchus jumps out of the water and attacks Matilda, but misses, and gets fought off by the Tyrannosaurus rex. This however, gives Nigel more time to reach higher ground and escape Matilda.
- A Deinosuchus attacks Nigel in the raft on the river, Nigel is barefoot one minute and has shoes on the next.
- Deinosuchus is more related to alligators than to the crocodile.