Brant
Brant
Branta bernicla
At a Glance
No other geese nest as far north as the Brant, and few migrate as far. These small geese are characteristic of coastal areas in summer and winter; most birdwatchers know them from seeing their wintering flocks along both of our coasts. Traveling between their summer and winter outposts, they may fly at altitudes of several thousand feet as they cross great expanses of land or open ocean.
All bird guide text and rangemaps adapted from Lives of North American Birds by Kenn Kaufman© 1996, used by permission of Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Category
Duck-like Birds, Ducks and Geese
IUCN Status
Least Concern
Habitat
Coasts and Shorelines, Lakes, Ponds, and Rivers, Open Ocean, Saltwater Wetlands, Tundra and Boreal Habitats
Region
Alaska and The North, California, Eastern Canada, Florida, Great Lakes, Mid Atlantic, New England, Northwest, Plains, Rocky Mountains, Southeast, Southwest, Texas, Western Canada
Behavior
Direct Flight, Formation
Population
490.000
Range & Identification
Migration & Range Maps
Long-distance migrant, traveling in flocks. Birds from central Canadian Arctic move down east side of Hudson Bay, then may make nonstop flight overland from southern James Bay to central Atlantic Coast of USA. In Alaska, large numbers gather at Izembek Lagoon and then depart almost simultaneously for long overwater flight to wintering areas on Pacific Coast. Migrating flocks may fly very high. Wintering birds may linger later in spring than most geese, as coastal breeding areas in high Arctic remain unsuitable for nesting until summer.
Description
22-30" (56-76 cm). Black head and neck with small white neck spot, dark back. Two types: eastern birds (also scarce in northwest) have white belly contrasting with black chest; western "Black Brant" has much darker belly (hard to see when birds are swimming). Young birds during first winter have pale bands on back.
Size
About the size of a Mallard or Herring Gull, About the size of a Heron
Color
Black, Brown, White
Wing Shape
Pointed, Tapered
Tail Shape
Rounded, Short, Square-tipped
Songs and Calls
A low guttural ruk-ruk.
Call Pattern
Flat, Rising, Undulating
Call Type
Croak/Quack, Odd, Rattle
Habitat
Salt bays, estuaries; tundra (summer). Usually on wet coastal tundra of high Arctic in summer, along coastlines in fairly mild climates in winter. Migrants may make regular stopovers on a few freshwater lakes in the interior of the continent.
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Behavior
Eggs
3-5, rarely up to 8. Creamy white to pale olive, becoming nest-stained. Incubation is by female only, 22-26 days, usually 24. When female leaves nest to feed, she covers eggs with down, keeping them warm.
Young
leave nest within 1-2 days after hatching, are tended by both parents and led to feeding areas, where young find their own food. In long daylight of high Arctic, young feed at all hours and develop rapidly, fledging at 40-50 days.
Feeding Behavior
forages by wading or tipping up in shallow water, or by walking on tidal flats or on shore. Feeds in flocks at most times of year.
Diet
mostly plant material. In migration and winter, eats aquatic plants; eelgrass heavily favored where available, also takes wigeon grass, rockgrass, green algae, others. On breeding grounds, grazes on sedges, grasses, pondweed, others. Also eat a few aquatic insects, mollusks, worms.
Nesting
Pair bond usually formed on wintering grounds. Often breeds in loose colonies. Nest site is on small island in tundra pond, slight rise in low grassy flats, usually within 1-5 miles of coast and often subject to destruction by storm tides. Nest is a shallow bowl of grass and other materials, heavily lined with down.
Climate Vulnerability
Conservation Status
In 1930s, a sudden die-off of eelgrass along Atlantic Coast (the main winter food of Brant) may have had serious impact on this species. No long-term damage to numbers, as Brant were able to switch to other food sources, and eelgrass has made partial recovery in these areas.
Climate Threats Facing the Brant
Choose a temperature scenario below to see which threats will affect this species as warming increases. The same climate change-driven threats that put birds at risk will affect other wildlife and people, too.