Because of their black colouration, Cormorants are often referred to as sea crows. While Cormorants do appear black, close inspection reveals that they are, in fact, a variety of dark colours ranging from green and violet to ultramarine and bronze. In breeding plumage, these large seabirds have intensely bright patches, which occur in a variety of specific colours, around their eyes and throat. Cormorants possess a gular sac, or throat pouch, that has a variety of functions. It acts as a holding area for larger prey, helps the bird rid itself of extra heat while panting, and in the breeding season, the bright colours of the pouch are used for display during courtship. These water birds have distinctive long, slender, hooked bills. Although their large feet make these birds exceptional swimmers, they are not elegant walkers.
