Black caiman crocodile, also known as black crocodile, is a reptile belonging to the family Alligatoridae in the order Crocodiles. The black caiman is the largest caiman in terms of body size, with a body length of up to four to five meters. Its head is long and wide, and there is a raised spine along its back. Its color gradually darkens as it grows. Due to the protruding spine in the middle of the eyes of the black caiman, which resembles a eyeglass frame, it is named the spectacled crocodile. Mainly distributed in northern South America, inhabiting various wetlands.. Black caimans have a wide diet, mainly consisting of fish, snakes, dolphins, iguanas, and large mammals. They sometimes hunt other crocodiles, but rarely attack humans.

Crocodiles are reptiles of the Crocodylidae and Alligatoridae families, belonging to 8 genera and 23 species. Crocodiles have a longer torso; Muscular development; Flat head, skin tightly attached to the skull, strong skull connection, unable to move; The teeth are cone-shaped and grow in the alveolar cavity, with more than 25 teeth on each side; The tongue is short and flat, unable to extend outward; Small and slightly protruding eyes; The tail is thick and slightly flattened; Short and thick limbs; The external nostril is located on the back of the snout and has a valve on top; There are scales like armor. As one of the oldest species on Earth to date, it retains many features of early dinosaur reptiles and is also known as "living fossils".