Order: Procellariiformes (2023 update)
Family: Hydrobatidae - Northern Storm-Petrels

European Storm-PetrelHydrobates pelagicus
European Storm-Petrel (British)Hydrobates pelagicus pelagicusBreeds NE Atlantic; winter range unknown, possibly to Indian Ocean
European Storm-Petrel (Mediterranean)Hydrobates pelagicus melitensisBreeds Mediterranean; winter range unknown, possibly to Indian Ocean
Fork-tailed Storm-PetrelHydrobates furcatus
Hydrobates furcatus furcatusN Kuril, Komandorskiye and Aleutian islands
Hydrobates furcatus plumbeusIslands off s Alaska to n California
Ringed Storm-PetrelHydrobates hornbyiRanges coastal Ecuador to central Chile
Leach's Storm-PetrelHydrobates leucorhous
Leach's Storm-Petrel (Leach's)Hydrobates leucorhous leucorhousbreeds in the north Pacific, from northeastern Japan through the Kuril and Aleutian Islands to southeastern Alaska, south to central California (Farallon Islands); and in the north Atlantic from the northeastern USA (Massachusetts, Maine) and eastern Canada east to Iceland, the Faeroe Islands, northern Scotland, and northwestern Norway; very small population also breeding (since 1995) on Dyer and Dassen Islands (Western Cape, South Africa; still extant?), and unsuccessful nesting attempted on Chatham Islands, New Zealand. winters primarily in central and eastern Pacific, south to 27°S, and in the tropical Atlantic, especially in waters off West Africa, but south to northeastern Brazil and South Africa
Leach's Storm-Petrel (Chapman's)Hydrobates leucorhous chapmaniCoronados Islands and San Benito Islands (nw Mexico)
Townsend's Storm-PetrelHydrobates socorroensissummer breeder on islets off Guadalupe I. (western Mexico); ranges in eastern Pacific north to southern California and south to ca 10º N
Ainley's Storm-PetrelHydrobates cheimomnesteswinter breeder on islets off Guadalupe I. (western Mexico); nonbreeding range poorly known, but apparently disperses south in eastern Pacific, to at least as far as the Galapagos Islands
Swinhoe's Storm-PetrelHydrobates monorhisBreeds islands off Japan; disperses to n Indian Ocean
Ashy Storm-PetrelHydrobates homochroaBreeds islands off California; ranges to s Baja California
Band-rumped Storm-PetrelHydrobates castroBreeds and ranges tropical Atlantic and Pacific Oceans
Band-rumped Storm-Petrel (Madeiran)Hydrobates castro castroBreeds (summer) on Madeira and Canary Islands; distribution at sea is not well documented
Band-rumped Storm-Petrel (Grant's)Hydrobates castro [undescribed form]Breeds (winter) on the Azores, Madeira, and Canary Islands; disperses at sea to the Gulf of Mexico and Western Atlantic
Band-rumped Storm-Petrel (Darwin's)Hydrobates castro bangsiBreeds Galapagos Islands; disperses at sea to Eastern Pacific (waters off of southern Central America)
Monteiro's Storm-PetrelHydrobates monteiroiBreeds in summer on Azores; extent of at-sea range unknown, possibly to e. North America
Cape Verde Storm-PetrelHydrobates jabejabeBreeds in winter on Cape Verde Islands; extent of at-sea range unknown, possibly to e. North America
Wedge-rumped Storm-PetrelHydrobates tethys
Hydrobates tethys tethysGalapagos Islands (Pitt, Genovesa and Redonda)
Hydrobates tethys kelsalliIslas Pescadores and San Gallán (off coast of Peru)
Black Storm-PetrelHydrobates melaniaBreeds islands off California and Baja; ranges to Peru
Markham's Storm-PetrelHydrobates markhamiBreeds Paracas Peninsula (Peru); ranges to s Mexico and Chile
Matsudaira's Storm-PetrelHydrobates matsudairaeBreeds Volcano Islands (Japan); disperses to Indian Ocean
Tristram's Storm-PetrelHydrobates tristramiBreeds and ranges Hawaii, Izu and Volcano islands
Least Storm-PetrelHydrobates microsomaBreeds islands off Baja Calif.; ranges south to extreme n Peru