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.

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.

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• A 2003 study found that their telomeres, which is the region of repetitive DNA at the end of chromosomes, lengthen with age, the only known example until 2006, when this trait was shown in Great Frigatebirds also.
• They are strictly nocturnal at breeding sites to avoid predation by gulls and skuas, and will even avoid coming to land on clear moonlit nights.
• They have an average lifespan of 20 years, the maximum recorded age is 36 years.
• The Leach's Storm-Petrel was first described in 1818 by Louis Jean Pierre Vieillot, a French ornithologist. It is named for the British zoologist William Elford Leach.

• Fork-tailed Storm-Petrel
• Wedge-rumped Storm-Petrel
• Wilson's Storm-Petrel
• Black Storm-Petrel
• Ashy Storm-Petrel
• Band-rumped Storm-Petrel
• White-faced Storm-Petrel

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-two species of storm-petrels in seven genera found throughout the oceans of the world.

NORTH AMERICA

Fifteen 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, the numerous Wilson’s Storm-Petrel, and the rare White-faced Storm-Petrel are members of this maritime family.

KNOWN FOR

The Wilson’s Storm-Petrel is known for the peculiar behavior of pattering its feet on the surface of the water while foraging. 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

Except for the gray and white Fork-tailed and White-faced Storm-Petrels, 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. The webs of the feet of the Wilson’s Storm-Petrel are yellow (a characteristic rarely visible in field conditions).

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, the Wilson’s Storm-Petrel in particular making incredible voyages from its breeding grounds in the Antarctic to waters of the Northern Hemisphere.

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.

Author

Artist

Yury Lisyak