{"id":8388,"date":"2026-10-23T16:26:22","date_gmt":"2026-10-23T16:26:22","guid":{"rendered":"https:\/\/wordpress.viu.ca\/biol325\/?p=8388"},"modified":"2026-10-23T16:26:24","modified_gmt":"2026-10-23T16:26:24","slug":"snow-geese-a-conservation-story-too-successful","status":"publish","type":"post","link":"https:\/\/wordpress.viu.ca\/biol325\/2026\/10\/23\/snow-geese-a-conservation-story-too-successful\/","title":{"rendered":"Snow Geese: A Conservation Story Too Successful?"},"content":{"rendered":"
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Figure 1:<\/strong> A small group of snow geese foraging on a lawn. (Photo by E. Kludash)<\/p>\n\n\n\n

It\u2019s hard to miss the snow goose (Anser caerulescens<\/em>). While usually a mostly white goose with a little bit of black, they come in another fun flavour as well. You\u2019re most likely to see them when they come south for the winter and spend their time in farm fields or near water in huge flocks. In fact, there\u2019s so many snow geese that they\u2019re damaging their own habitats! Let\u2019s dive in and see what makes the snow goose so special.<\/p>\n\n\n\n

Description and Identification<\/h2>\n\n\n
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Figure 2:<\/strong> A typical, white snow goose standing amongst a flock of other geese. (Photo by E. Kludash)<\/p>\n\n\n\n

Snow geese are a large, usually white bird standing at 64-79 cm tall, and having a wingspan of 130-170 cm. They have black wingtips, a pink bill with a black patch on the sides, and pink legs. The males are typically bigger than the females, but there\u2019s quite a bit of overlap between different populations\u2019 sizes. (Ducks Unlimited<\/a>) You might see some that are orange or yellow-ish, especially on the head, which makes them look like they recently ate a messy spaghetti meal. That happens when there\u2019s iron in the water they feed in, and the feathers get stained (All About Birds<\/a>).<\/p>\n\n\n

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Figure 3:<\/strong> A blue morph snow goose with its face stained by iron in the water. (Photo by Jim Edelhuber<\/a>)<\/p>\n\n\n\n

Some snow geese are called \u201cblue\u201d when their feathers are mostly dark, leaving only the face white. You can tell it\u2019s still a snow goose by the iconic black patch on the pink bill, and the pink legs (All About Birds<\/a>). Some birds are a mix between a blue and white morph, called the intermediate morph. The intermediates will have varying amounts of white on them, mostly on the head and belly (Ducks Unlimited<\/a>).<\/p>\n\n\n

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Figure 4:<\/strong> A juvenile white morph snow goose. (Photo from All About Birds<\/a>)<\/p>\n\n\n

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Figure 5:<\/strong> A juvenile blue morph snow goose. (Photo from All About Birds<\/a>)<\/p>\n\n\n\n

Juvenile white morph snow geese can be identified by their mostly white feathers with patches of grey. They still have the pink bill with a black patch on it, like the adult geese. Juvenile blue morph snow geese are entirely dark, even on the bill. You can still see the arched ridge where the black patch would be if the bill was pink (All About Birds<\/a>).<\/p>\n\n\n\n

Distribution and Habitat<\/h2>\n\n\n
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Figure 6:<\/strong> A map showing the range of the snow goose. The red areas are where they breed, yellow is where they migrate through, and blue is where they spend the winter. (Photo from All About Birds<\/a>)<\/p>\n\n\n\n

Snow geese breed in the north, mostly in the Canadian Territories, but also around the Hudson Bay, Greenland, and Wrangel Island in Russia. Like many Canadians, they migrate south during the winter, mostly wintering in the United States, and some areas of Mexico (All About Birds<\/a>).<\/p>\n\n\n\n

You can find snow geese at wetlands, lakes, ponds, or even farm fields while they\u2019re migrating and during the winter. If you\u2019re up north in the summer, you can look for them on the tundra close to the coast, at lakes, or at rivers. (Audubon<\/a>)<\/p>\n\n\n\n

Behaviour<\/h2>\n\n\n\n

Snow geese tend to mate for life, and usually begin breeding at around 3 years old (Audubon<\/a>), however the snow geese of Wrangel Island, Russia often begin forming mating pairs and beginning to breed at a later age. Some of the Wrangel Island snow geese may not even pair up until they\u2019re over 5 years old! Most geese form their pairs during winter, but a few don\u2019t plan ahead and pair up during migration instead, or even when they\u2019re already at the breeding ground. (B. Ganter et al., 2004)<\/p>\n\n\n

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Figure 7:<\/strong> A snow goose standing by their grass and down nest containing 3 eggs. (Photo by NatureWorks by PBS<\/a>)<\/p>\n\n\n\n

The female chooses a sheltered spot for the nest, often near a small pond. The female starts the nest by scraping the ground, then adds some fluffy down feathers from her breast to the nest, as well as leaves, twigs, or seaweed. The nests can grow up to anywhere from 3 to 6.5 feet across (All About Birds<\/a>).<\/p>\n\n\n\n

They can lay between 1-8 cream coloured eggs, but usually 3-5. The female incubates the eggs for 22-25 days before they hatch (Audubon<\/a>), while the male guards the nest (All About Birds<\/a>). The newly hatched geese can leave the nest and find their own food within hours, but are still tended to by both parents for 42-50 days until they can fly on their own (Audubon<\/a>).<\/p>\n\n\n

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Figure 8:<\/strong> A large flock of snow geese. (Photo by Craig Bihrle<\/a>)<\/p>\n\n\n\n

Snow geese enjoy the company of others, often forming huge flocks of hundreds of birds. They forage together in shallow water or on land, eating almost entirely plant matter (though young will eat some insect larvae) (Audubon<\/a>). They eat the leaves, roots, and seeds of grasses, as well as other grass-like plants such as sedges. In the fall they often eat berries as well, and during winter they feed on extra grain they forage at agricultural fields (All About Birds<\/a>).<\/p>\n\n\n\n

Conservation Status<\/h2>\n\n\n\n

Snow geese are of least concern on the IUCN red list, and are one of the two most abundant goose species in North America (Lefebvre et al., 2017). Their numbers were reduced to only a few thousand around the year 1900, but have grown significantly over the last several decades (Audubon<\/a>). It\u2019s now estimated that there are around 16 million snow geese worldwide (All About Birds<\/a>).<\/p>\n\n\n

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Figure 9:<\/strong> A large number of snow geese occupying an agricultural field. (Photo by Dave Ingram<\/a>)<\/p>\n\n\n\n

This has been a great success story for species conservation, however the geese are now overabundant and damaging the habitats in which they live, which also affects other species that live in the same habitats (Lefebvre et al., 2017).<\/p>\n\n\n\n

Overgrazing by snow geese significantly reduces the amount of invertebrates living in marshy areas. This could be because the geese are accidentally eating or killing the invertebrates while they\u2019re feeding on plants, or because the invertebrates move away from the cleared areas toward places that still have plant cover. These invertebrates are an important food source for other waterbirds and shore birds (M. Sherfy et al., 2003).<\/p>\n\n\n\n

In addition, the snow geese have been damaging farms by feeding on the seedlings of many crops, causing economic harm. Hunting them was banned in the United States for many years, but was allowed again to try to control the population in 1975. Ideally, their population should be maintained at about 800 000 – 1 000 000 geese (Lefebvre et al., 2017). While they may have overshot the mark, this goes to show that conservation efforts can work incredibly well.<\/p>\n\n\n\n

Cultural Significance<\/h2>\n\n\n\n

Snow geese are harvested and eaten by some indigenous communities in Canada. The geese are then cooked in all sorts of different ways, such as making jerky, roasting them, or boiling the meat. (Parks Canada<\/a>).<\/p>\n\n\n\n

Other parts of the goose are used in a variety of different ways by indigenous communities, as well. With skin and feathers used to make bedding, clothes stuffed with down, and wings used as brooms, no part of the goose is wasted. Even the trachea can be used to make a flute by children (Sirmilik National Park<\/a>).<\/p>\n\n\n\n

Interesting Info<\/h2>\n\n\n\n