Rio Lagartos is a nature reserve in northern Yucatan. The name comes from the Spanish colonizers, mistaken both of the words Rio and Lagartos: in fact it is a huge estuary (ría in Spanish), not a river (rio), and the "lizards" that live there are not alligators (lagartos), but crocodiles.
The Mexican crocodile (Crocodylus moreletii) is distinguished from alligators by teeth. In fact, it has a perfectly aligned teeth. The fourth tooth on the lower jaw is visible when the mouth is closed because it is slightly larger than the rest of its teeth.