However, fossils of a large river monster species have been found in 10 states in America and northern Mexico. This extinct giant named Deinosuchus, the 'terrible crocodile' was believed to have ...

Deinosuchus riograndensis holotype specimen (AMNH 3073) anterior mandible. A, anterior mandible in dorsal view. B, anterior mandible in ventral view. C, left anterior mandibular ramus in lateral view.