The Jacaré-açu (Melanosuchus niger) is the Black Caiman, a crocodilian. It is the largest species of crocodile, with an average size of 3.5 meters and over 300 kg. Specimens have been found with more than 5.5 meters long and probably half ton of weight. It is a carnivorous reptile that lives along slow-moving rivers and lakes. It was hunted to near extinction primarily for its commercially valuable hide. It is a species that was on the verge of extinction due to the commercial value of its black leather and their meat.