The yacare caiman is a medium-sized semi-aquatic reptile (up to 2 m long), recognizable by the bony ridge between its eyes that resembles eyeglasses. Found in South America (northern Argentina, Brazil, Paraguay), it inhabits freshwater marshes, lakes, rivers, and floodplains. An opportunistic omnivore, it feeds on fish, crustaceans, birds, and small mammals. During the breeding season, males produce deep grunts and aggressively defend aquatic territories, while females build vegetation nests and lay 20–40 eggs.