the surface of fresh water. Terns are generally long-lived birds, with several species known to live in excess of 30 years. Tropicbirds Order: PhaethontiformesFamily: Phaethontidae Tropicbirds are slender white birds of tropical oceans with exceptionally long central tail feathers. Their long wings have black markings, as does the head. Loons Order: GaviiformesFamily: Gaviidae Loons, known as divers in Europe, are a group of aquatic birds found in many parts of North America and northern Europe. They are the size of a large duck or small goose, which they somewhat resemble when swimming, but to which they are completely unrelated. Albatrosses Order: ProcellariiformesFamily: Diomedeidae The albatrosses are among the largest flying birds, with long, narrow wings for gliding. The majority are found in the Southern Hemisphere with only vagrants occurring in the North Atlantic. Southern storm-petrels Order: ProcellariiformesFamily: Oceanitidae Southern storm-petrels, are seabirds in the family Oceanitidae, part of the order Procellariiformes. These smallest of seabirds feed on planktonic crustaceans and small fish picked from the surface, typically while hovering. Their flight is fluttering and sometimes bat-like. Northern storm-petrels Order: ProcellariiformesFamily: Hydrobatidae The northern storm-petrels are relatives of the petrels and are the smallest seabirds. They feed on planktonic crustaceans and small fish picked from the surface, typically while hovering. The flight is fluttering and sometimes bat-like. Shearwaters and petrels Order: ProcellariiformesFamily: Procellariidae The procellariids are the main group of medium-sized "true petrels", characterised by united nostrils with medium septum and a long outer functional primary. Storks Order: CiconiiformesFamily: Ciconiidae Storks are large, long-legged, long-necked, wading birds with long, stout bills. Storks are mute, but bill-clattering is an important mode of communication at the nest. Their nests can be large and may be reused for many years. Many species are migratory. Frigatebirds Order: SuliformesFamily: Fregatidae Frigatebirds are large seabirds usually found over tropical oceans. They are large, black, or black-and-white, with long wings and deeply forked tails. The males have colored inflatable throat pouches. They do not swim or walk and cannot take off from a flat surface. Having the largest wingspan-to-body-weight ratio of any bird, they are essentially aerial, able to stay aloft for more than a week. Boobies and gannets Order: SuliformesFamily: Sulidae The sulids comprise the gannets and boobies. Both groups are medium to large coastal seabirds that plunge-dive for fish. Cormorants and shags Order: SuliformesFamily: Phalacrocoracidae Phalacrocoracidae is a family of medium to large coastal, fish-eating seabirds