Snow Geese breed in colonies on Canadian and Northern Alaskan tundra in the vicinity of the coast, from the high arctic to the subarctic. They choose areas near ponds, shallow lakes, coastal salt marshes, or streams (including river islands), preferring rolling terrain that loses its snow early and escapes flooding during spring thaw. Snow Geese form three separate regional populations—eastern, central, and western—distinctions that are more or less preserved as the geese migrate to their wintering grounds. After chicks hatch, families move to brood-rearing territories with a lot of grasses and bryophytes, including tidal marshes and wet areas near ponds. During spring and fall migration along all four major North American flyways, geese frequently stop in open areas like lakes, farm fields, protected freshwater and brackish marshes, sluggish rivers, and sandbars. They winter in regions on both American coasts as well as in some inland areas, frequenting open habitats like marshes, grasslands, marine inlets, freshwater ponds, and agricultural fields.Back to top
Snow Geese are vegetarians with voracious appetites for grasses, sedges, rushes, forbs, horsetails, shrubs, and willows. They will consume nearly any part of a plant—including seeds, stems, leaves, tubers, and roots—either by grazing, shearing plants off at ground level, or ripping entire stems from the ground. In winter and during migration they also eat grains and young stems of farm crops, along with a variety of berries. Goslings may eat fruits, flowers, horsetail shoots, and fly larvae.Back to top
Accompanied by the male, the female chooses a nest site, typically sheltered among vegetation like sea-lyme grass or willows, along with rocks or small shrubs. They build nests on dry ground when possible—although, being close to melted snow, the site is often moist. They use island sites or areas near to small ponds when those are available. The female sometimes starts several scrapes before choosing the final location. She may lay the first egg within an hour of selecting the site.
The female builds the nest by herself, working at any time of day. She starts with a simple scrape in the earth, but as she lays more eggs she adds fluffy down feathers plucked from her own breast (sometimes in very large amounts) and may add material like sea-lyme grass, eelgrass, leaves and twigs of willow and birch, or seaweed. The less protected the site, the heftier the nest: they range from 3 to 6.5 feet across.
|Clutch Size:||2-6 eggs|
|Number of Broods:||1 brood|
|Egg Length:||3.1-3.3 in (7.9-8.3 cm)|
|Egg Width:||2.0-2.2 in (5.1-5.5 cm)|
|Incubation Period:||24 days|
|Nestling Period:||1 day|
|Egg Description:||Elongated oval with variable texture. Creamy white but easily staining to dirty gray.|
|Condition at Hatching:||Eyes open and body fully covered with down.|
Snow Geese are strong fliers, walkers, and swimmers (even capable of diving short distances when threatened). Their main activities are feeding and resting: they forage on foot and sleep while sitting, standing on one leg, or swimming. During migration and winter, they roost mainly at night and afloat. Snow Geese stay with the same mate for life, choosing an individual of the same color morph (white or “blue”) as the family members they grew up with. The female incubates the eggs and nestlings, spending 21 or more hours per day on the nest, while the male stands guard to defend females and nest sites against predators and other Snow Geese. The male may leave the female to defend the nest herself for extended periods. During the breeding season, eggs and nestlings are at risk from arctic and red foxes, Glaucous Gulls, Herring Gulls, Parasitic Jaegers, caribou, polar and black bears, gray wolves, Common Ravens, Long-tailed Jaegers, and Snowy Owls. Adults may be hunted by foxes, wolves, bears, Bald Eagles, or Golden Eagles, more so during nesting season than during migration and winter.Back to top
Snow Goose numbers have grown rapidly since the mid-twentieth century, possibly because of warming conditions in their arctic breeding grounds. Populations in the eastern and western arctic have tripled since 1973, and the central arctic population has grown by a factor of 25. These birds can be found breeding in the far north of Canada and winter principally in the U.S. and Mexico. Snow Geese are federally protected migratory game birds, and their hunting is managed on a population-by-population basis. The species is not on the 2014 State of the Birds Watch List. Throughout much of the twentieth century management officials restricted hunting in the interest of conservation, but by the 1970s they switched to worrying about keeping goose numbers in check. In the late 1990s both Canada and the United States began to permit extra hunting to reduce Snow Goose populations. About 400,000 Snow Geese are now hunted annually in the U.S. and Canada. Because Snow Geese nest in remote areas, their breeding colonies have suffered little impact from humans. The geese themselves may degrade their own habitat by grubbing vigorously for food during the early breeding season, not only reducing their own breeding success but also compromising nesting shorebirds. Like many waterfowl, Snow Geese can suffer from lead poisoning when they ingest fallen lead shot while foraging. This problem can be reduced by switching to steel shot or other non-toxic ammunition. Back to top
Lutmerding, J. A. and A. S. Love. Longevity records of North American birds. Version 2015.2. Patuxent Wildlife Research Center, Bird Banding Laboratory 2015.
Mowbray, Thomas B., Fred Cooke and Barbara Ganter. (2000). Snow Goose (Anser caerulescens), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.
Raftovich, R. V., K. A. Wilkins, S. S. Williams and H. L. Spriggs. (2012a). Migratory bird hunting activity and harvest during the 2010 and 2011 hunting seasons. Laurel: US Fish and Wildlife Service.
Sibley, D. A. (2014). The Sibley Guide to Birds, second edition. Alfred A. Knopf, New York, USA.