Bittern's cousin is a term used to refer to two species of wading birds, the EGRET and the HERON. The EGRET is a white bird with long legs and a long neck, while the HERON is a larger bird with a grey-blue body and a long neck. Both species are found in wetlands and marshes, where they feed on fish, frogs, and other aquatic animals. They are both members of the Ardeidae family, which includes bitterns, herons, egrets, and ibises.