Melanosuchus niger

Black Caiman, a reference photo
Photo: Rigelus · CC BY-SA 3.0 (licence)

The black caiman (Melanosuchus niger) is a crocodilian reptile endemic to South America. With a maximum length of around 5 to 6.5 m (16 to 21 ft) and a mass of over 450 kg (1,000 lb), it is the largest living species of the family Alligatoridae, and the third-largest crocodilian in the Neotropical realm. True to its common and scientific names, the black caiman has a dark greenish-black coloration as an adult. In some individuals, the pigmentation can appear almost jet-black.

From Wikipedia, under CC BY-SA 4.0.

Is it venomous or poisonous?

We have no record of Black Caiman being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Crocodylia
Family
Alligatoridae
Species
Melanosuchus niger

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Black Caiman (Melanosuchus niger) · B.inomen