Guide to North American Birds

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Breeding adult. Photo: Duncan McCaskill/Flickr (CC BY NC 2.0)

Sooty Tern

Onychoprion fuscatus

While most terns inhabit marshes and shores, the Sooty Tern has the life of a true seabird. A long-winged flier, it wanders tropical oceans, nesting on remote islands. Many nest in Hawaii, but North American birders often seek the species by visiting the islands of the Dry Tortugas, west of the Florida Keys. Noisy around its nesting colonies by day and night; a sailors' name for the bird is "wide-awake."

Conservation status	Abundant and widespread in tropical oceans around the world. Colonies on Tortugas and some in Hawaii are strictly protected.
Family	Gulls and Terns
Habitat	Warm tropical seas. Generally far out at sea, wandering widely but often following warm-water currents. Avoids shallow waters and areas near mainland coast. Nests mostly on small islands, on open sandy beaches with sparse vegetation.

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Feeding Behavior

Forages by dipping down in flight to take fish from surface of water (or may take flying fish from above surface). Rarely or never plunges into water for prey below surface. Feeds mainly where small fish have been driven to surface by schools of large predatory fish, congregating quickly where such temporary concentrations of food exist.

Eggs

One. Whitish, variably marked with brown, lavender, gray, sometimes black. Incubation is by both sexes, 28-30 days. On hot days, parents stand and shade the eggs. Young: Both parents feed young, regurgitating small fish. Young wanders in vicinity of nest, may return to it to be fed. Capable of flight at about 8-9 weeks, may stay around colony another 2-3 weeks.

Young

Both parents feed young, regurgitating small fish. Young wanders in vicinity of nest, may return to it to be fed. Capable of flight at about 8-9 weeks, may stay around colony another 2-3 weeks.

Diet

Mostly fish, some squid. Feeds mainly on small fish that live in dense schools far out at sea. Also some small squid.

Nesting

May not breed until age of 6 years or older. At Dry Tortugas, arrives in numbers two months before first eggs laid. At first, flocks visit site at night, circling over islands and calling, departing at dawn. Courtship involves high flight and gliding descent; on ground, birds strut and bow. Nest site is on ground, usually in open, sometimes under edge of shrubs. Nest (probably built by both sexes) is shallow scrape in soil, sometimes lined with a few leaves.

Illustration © David Allen Sibley.
Learn more about these drawings.

Text © Kenn Kaufman, adapted from
Lives of North American Birds

Migration

Young birds from Tortugas may move south through Caribbean and then east, to equatorial waters off West Africa, not returning for several years. Adults probably do not go as far, mostly dispersing in Gulf of Mexico and elsewhere in general region.