often with black markings on the head or wings. They have stout, longish bills and webbed feet. Black-legged kittiwake (), Rissa tridactyla Ivory gull (), Pagophila eburnea (A) Sabine's gull (), Xema sabini (A) Bonaparte's gull (), Chroicocephalus philadelphia (A) Black-headed gull (), Chroicocephalus ridibundus Little gull (), Hydrocoleus minutus (A) Laughing gull (), Leucophaeus atricilla (A) Franklin's gull (), Leucophaeus pipixcan (A) Common gull (), Larus canus (A) Short-billed gull, Larus brachyrhynchus (A) Ring-billed gull (), Larus delawarensis Herring gull (), Larus argentatus Iceland gull (), Larus glaucoides Lesser black-backed gull (), Larus fuscus (A) Glaucous gull (), Larus hyperboreus Great black-backed gull (), Larus marinus Least tern (), Sternula antillarum (A) Caspian tern (), Hydroprogne caspia (A) Black tern (), Chlidonias niger (A) Roseate tern (), Sterna dougallii (A) Common tern (), Sterna hirundo Arctic tern (), Sterna paradisaea Forster's tern (), Sterna forsteri (A) Royal tern (), Thalasseus maximus (A) Sandwich tern (), Thalasseus sandvicensis (A) Loons Order: GaviiformesFamily: Gaviidae Loons are aquatic birds, the size of a large duck, to which they are unrelated. Their plumage is largely grey or black, and they have spear-shaped bills. Loons swim well and fly adequately, but are almost hopeless on land, because their legs are placed towards the rear of the body. Red-throated loon (), Gavia stellata Common loon (), Gavia immer Southern storm-petrels Order: ProcellariiformesFamily: Oceanitidae The storm-petrels are the smallest seabirds, relatives of the petrels, feeding on planktonic crustaceans and small fish picked from the surface, typically while hovering. The flight is fluttering and sometimes bat-like. Until 2018, this family's three species were included with the other storm-petrels in family Hydrobatidae. Wilson's storm-petrel (), Oceanites oceanicus (A) Northern storm-petrels Order: ProcellariiformesFamily: Hydrobatidae Though the members of this family are similar in many respects to the southern storm-petrels, including their general appearance and habits, there are enough genetic differences to warrant their placement in a separate family. Leach's storm-petrel (), Hydrobates leucorhous Shearwaters and petrels Order: ProcellariiformesFamily: Procellariidae The procellariids are the main group of medium-sized "true petrels", characterized by united nostrils with medium septum and a long outer functional primary. Northern fulmar (), Fulmarus glacialis Cory's shearwater (), Calonectris diomedea (A) Sooty shearwater (), Ardenna griseus Great shearwater (), Ardenna gravis Manx shearwater (), Puffinus puffinus Frigatebirds Order: SuliformesFamily: Fregatidae Frigatebirds are large seabirds usually found over tropical oceans. They are large, black, or black-and-white, with long