The Aruanã-prateado (Osteoglossum bicirrhosum) sometimes spelled arawana, is a freshwater bony fish of the family Osteoglossidae. This species is found in the Amazon River basin. The Aruanã-prateado has relatively large scales, a long body, and a tapered tail. It can grow to around 48 inches in length. The species is also known because it of its ability to jump out of the water and capture its prey. It usually swims near the water surface waiting for potential prey. Although Aruanã-prateado have been found with the remains of birds, bats, and snakes in their stomachs, its main diet consist of crustaceans, insects, smaller fishes and other animals that float on the water surface, for which its draw-bridge-like mouth is exclusively adapted for feeding.