It's tempting to use Donna as a metaphor for the plight of the world's 23 recognized species of crocodilians, a group of related reptiles including crocodiles, alligators, caimans, and gharials.

(Image Credit: Jorge Gonzalez) Crocodiles are persistent — not just in their deadly pursuit of prey, but in terms of their existence. The contemporary species hails from a 230-million-year lineage ...

American crocodiles are one of two crocodilian species in Costa Rica with the other being the spectacled caiman. Of the two, crocodiles are significantly larger. At the top end, large male American ...

The head scales on these crocodiles were somewhere in between—partially polygonal and labyrinthine—a shape and size that resembled the scales of another species, the Caiman crocodile. The team also ...