darters are often called "snake-birds" because of their long thin neck, which gives a snake-like appearance when they swim with their bodies submerged. The males have black and dark-brown plumage, an erectile crest on the nape, and a larger bill than the female. The females have much paler plumage especially on the neck and underparts. The darters have completely webbed feet and their legs are short and set far back on the body. Their plumage is somewhat permeable, like that of cormorants, and they spread their wings to dry after diving. Cormorants and shags Order: SuliformesFamily: Phalacrocoracidae Phalacrocoracidae is a family of medium to large coastal, fish-eating seabirds that includes cormorants and shags. Plumage colouration varies, with the majority having mainly dark plumage, some species being black-and-white, and a few being colourful. Pelicans Order: PelecaniformesFamily: Pelecanidae Pelicans are large water birds with a distinctive pouch under their beak. As with other members of the order Pelecaniformes, they have webbed feet with four toes. Hamerkop Order: PelecaniformesFamily: Scopidae The hamerkop is a medium-sized bird with a long shaggy crest. The shape of its head with a curved bill and crest at the back is reminiscent of a hammer, hence its name. Its plumage is drab-brown all over. Herons, egrets, and bitterns Order: PelecaniformesFamily: Ardeidae The family Ardeidae contains the bitterns, herons, and egrets. Herons and egrets are medium to large wading birds with long necks and legs. Bitterns tend to be shorter necked and more wary. Members of Ardeidae fly with their necks retracted, unlike other long-necked birds such as storks, ibises, and spoonbills. Ibises and spoonbills Order: PelecaniformesFamily: Threskiornithidae Threskiornithidae is a family of large terrestrial and wading birds which includes the ibises and spoonbills. They have long, broad wings with 11 primary and about 20 secondary feathers. They are strong fliers and despite their size and weight, very capable soarers. Secretarybird Order: AccipitriformesFamily: Sagittariidae The secretarybird is a bird of prey easily distinguished from other raptors by its long crane-like legs. Osprey Order: AccipitriformesFamily: Pandionidae The family Pandionidae contains only one species, the osprey. The osprey is a medium-large raptor which is a specialist fish-eater with a worldwide distribution. Hawks, eagles, and kites Order: AccipitriformesFamily: Accipitridae Accipitridae is a family of birds of prey, which includes hawks, eagles, kites, harriers, and Old World vultures. These birds have powerful hooked beaks for tearing flesh from their prey, strong legs, powerful