Ibises commonly nest near other waterbirds such as egrets, herons, spoonbills or cormorants. Seabirds also attack them from above, flocks of gannets, cormorants, terns and gulls. Songbirds, ducks, cormorants and blue herons are a common sight. Colonies of cormorants and pelicans are common. Other birds victimised include silver and Pacific gulls, cormorants and Australasian gannets. Other bird species include bald eagles, cormorants, and ospreys. Killer whales in many areas may prey on cormorants and gulls. They usually breed in colonies, occasionally mixed with cormorants or herons. Birds include seagulls, uria and cormorants. It is home for cormorants, painted storks and spoonbills. This early definition included frigatebirds, cormorants, and sulids, as well as pelicans. Cormorants and shags are medium-to-large seabirds. The American mink often kills birds, including larger species like seagulls and cormorants, by drowning. The group included frigatebirds, gannets, cormorants, anhingas, and tropicbirds. There are many varieties of duck; buffleheads, goldeneyes, mallards, and cormorants.