Caiman crocodilus

"The spectacled caiman (Caiman crocodilus), also known as the white caiman or common caiman, is a crocodilian reptile found in much of Central and South America. It lives in a range of lowland wetland and riverine habitat types and can tolerate salt water as well as fresh; due in part to this adaptability it is the most common of all crocodilian species. Males of the species are generally 2 to 2.5 metres (6.6 to 8.2 ft), while females are smaller, usually around 1.4 metres (4.6 ft). The species' common name comes from a bony ridge between the eyes, which gives the appearance of a pair of spectacles. They have been known to change color. During colder weather the black pigment, found within their skin cells, will expand making them darker."

- Wikipedia