Overview
Leach's Storm-Petrel: This medium-sized petrel has a dark brown body and a white rump and under tail feathers. The wings are dark with a pale gray-brown bar on the upper wings. It has a long, dark forked tail, and a black bill, legs and feet. Its flight is bounding and erratic with frequent changes of direction and speed. It mainly feeds on fish, squid and shrimp. Sexes are similar.
The Leach's Storm-Petrel now has two subspecies, the Townsend's Storm-Petrel and Ainley's Storm-Petrel. Split in 2016 by the American Ornithologist Union. Both are outside of North America.
Range and Habitat
Leach's Storm-Petrel: Breeds along sea coasts and offshore islands from Aleutians south down the Pacific coast to Baja California; also in western Pacific and north Atlantic from Labrador south to Maine and Massachusetts. Spends winters mainly in tropical seas. This species is pelagic and only comes ashore to breed.
Northern Storm-Petrels (Hydrobatidae)
ORDER
A taxonomic order of tube-nosed seabirds, the PROCELLARIIFORMES (pronounced pro-sel-lehr-EYE-ih-FOR-meez) includes large, long-winged families such as the shearwaters and albatrosses, and the much smaller storm-petrels.
FAMILY TAXONOMY
In the Hydrobatidae (pronounced heye-droh-BAH-tih-dee) are included twenty species of storm-petrels in seven genera found throughout the oceans of the world.
NORTH AMERICA
Thirteen species of storm-petrels in five genera have occurred in North American waters (including the extinct Guadalupe Storm-Petrel). The sparrow-sized Least Storm-Petrel.
KNOWN FOR
Storm-petrels in general are known for being birds of the marine environment that only come to shore to breed.
PHYSICAL
Storm-petrels are small birds with long wings and medium to long tails that can be forked, square, or wedge-like in shape. Their legs are fairly long with webbed feet, and they have rounded pigeon-like heads. The bills of storm-petrels are small with a slightly hooked tip and tube-like nasal structures to expel excess salt.
COLORATION
North American members of this family have dark, sooty brown or black plumages. Some species also show a bit of gray in the wings, and white at the base of the tail.
GEOGRAPHIC HABITAT
Storm-Petrels are birds that only occur in salt-water habitats and can be found off both the Pacific and Atlantic coasts of North America. Usually, they are only encountered well offshore although the Least and Black Storm-Petrels can sometimes be seen from land.
MIGRATION
Except for the non-migratory Ashy Storm-Petrel, storm-petrels are very long distance migrants.
HABITS
Storm-Petrels nest in colonies and often forage in flocks that fly low over the water to pick small sea creatures and carrion off the surface. Flight patterns differ by species; some pattering the surface of the water with their feet, others flying in zig-zags and other species with rapid, almost bat-like wing-beats.
CONSERVATION
The Ashy Storm-Petrel is the only endangered North American storm-petrel species. It only breeds on islands off the California and Baja California coasts, and has strongly declined in numbers because of pollution.
INTERESTING FACTS
Like other Procellariiformes, storm-petrels are long-lived for being small birds; some individuals have lived for over thirty years. They are also highly nocturnal when coming to land to avoid depredation by large gulls. The name “petrel” is thought to have been derived from the name “Peter,” and is an allusion between the story of that Christian saint walking on water and the birds’ doing the same thing while foraging.