There is a rich wildlife on the islands in and on the Panama Canal. In addition to howler monkeys, there are also the endemic Panama capuchin monkeys, which can hardly be distinguished from their relatives, the white-shouldered capuchin (Cebus capucinus).
Howler monkeys (Alouatta) are a primate genus from the family of bracketed monkey (Atelidae). They live in Central and South America and are known for their loud shouting, which they mostly emit in the early morning. They feed on leaves and other plant material.
Barro Colorado Island is an artificial island, created by the damming of the Panama Canal in 1914.