Big Bend National Park was once home to the largest crocodilians in Earth's history. Deinosuchus was a giant 50 foot long creature that lived during the Cretaceous Period. Paleontologists speculate that Deinosuchus preyed upon hapless dinosaurs as they came to the water's edge to drink. At one site in the Big Bend we found teeth and other small bone fragments that most likely belonged to this giant crocodile.

Chasmosaurus, a late Cretaceous creature with a large shield as part of its skull inhabited the Big Bend. Like all Ceratopsids, Chasmosaurus was a vegetarian that most likely grazed on tree leaves. Paleontologists believe this animal was one of the few Ceratopsids that could stand on two legs

Members of the Collaborative observed large fragments of wing bones of a great Pteranodon. This Cretaceous Period glider could soar at 25 miles per hour and hunt fish. Wing bones of this flying dinosaur were very delicate and are rarely found preserved intact. The bones found at a site in Big Bend National Park were highly fragmented.