The silver arowana (Osteoglossum bicirrhosum) is a South American freshwater bony fish of the family Osteoglossidae. Silver arowanas are sometimes kept in aquariums, but they are predatory and require a very large tank.
The species is also called ‘water monkey’ because 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 specimens have been found with the remains of birds, bats, mice, and snakes in their stomachs, its main diet consists of snails, crustaceans (such as crabs), insects (such as beetles), spiders, smaller fish, and other animals that float on the water surface, which its drawbridge-like mouth is exclusively adapted for feeding on.