There are about 160 species worldwide, 53 in Britain and 47 in Wales. Order: GalliformesFamily: Tetraonidae  Grouse are sturdy, medium-sized terrestrial birds of the Northern Hemisphere. They have feathered feet and nostrils and short, rounded wings. They feed mainly on plant material and lay their eggs in a simple scrape on the ground. They are gamebirds and large numbers were shot in the past in moorland areas. There are about 19 species worldwide, 4 in Britain and 2 in Wales. Order: GalliformesFamily: Phasianidae  These are terrestrial species, feeding and nesting on the ground. They are variable in size but generally plump, with broad and relatively short wings. There are about 155 species worldwide, with 6 in Britain and Wales. 4 of these were introduced for hunting or ornamental purposes but 2 have now apparently died out. Order: GaviiformesFamily: Gaviidae  Divers are aquatic birds the size of a large duck, to which they are unrelated. They swim well and fly adequately but are almost hopeless on land, because their legs are placed towards the rear of the body. They feed on fish and other aquatic animals. There are 5 species worldwide, with 4 in Britain and Wales. They are all non-breeding visitors in Wales. Order: PodicipediformesFamily: Podicipedidae  Grebes are small to medium-large diving birds with lobed toes and pointed bills. They are seen mainly on lowland waterbodies and coasts. They feed on aquatic animals and nest on a floating platform of vegetation. There are about 19 species worldwide, with 6 in Britain and Wales. 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. There are at least 13 species worldwide, with 1 in Britain and Wales. Order: ProcellariiformesFamily: Procellariidae  These are highly pelagic birds with long, narrow wings and tube-shaped nostrils. They feed at sea on fish, squid and other marine life. They come to land to breed in colonies, nesting in burrows or on cliffs. There are 9 species which have been recorded in Wales. Order: ProcellariiformesFamily: Oceanitidae  The austral storm petrels are the smallest seabirds, feeding on plankton and small fish picked from the surface, typically while hovering.