FaunaHub

Goose

BirdWaterfowlHerbivore

A greylag goose standing on grass, showing its orange bill and grey plumage.

Greylag goose (Anser anser), the wild ancestor of most domestic geese.

Image: Hobbyfotowiki, CC0, via Wikimedia Commons.

Overview

Geese are large waterfowl in the family Anatidae, between ducks and swans in size and grouped mainly in the genera Anser (grey geese) and Branta (black geese). This page is a group-level overview; the greylag goose (Anser anser) is used as a familiar reference species and is the wild ancestor of most domestic geese. Geese are known for grazing, strong flocking, and long migrations.

Habitat & Range

Geese are associated with wetlands, grasslands, farmland, and water bodies such as lakes and rivers, often grazing on open land near water. Many species are strongly migratory, breeding at high latitudes and wintering farther south, and some have adapted well to parks, reservoirs, and agricultural land. Ranges vary by species and region.

Diet

Geese are largely herbivorous and feed by grazing on grasses, sedges, roots, and leaves, as well as grain and aquatic plants. Their bills are adapted for cropping vegetation. Diet shifts seasonally and regionally with the availability of forage, and large flocks feeding on farmland can sometimes bring them into conflict with agriculture.

Behavior

Geese are highly social and gather in flocks outside the breeding season, frequently flying in V-formations that are thought to save energy on long migrations. They are well known for forming strong pair bonds and for being protective and territorial when nesting. Loud honking calls help keep flocks in contact and serve as alarm signals.

Human Interaction & Conservation

People encounter geese as migratory wildlife, as park and farmland birds, and as domestic poultry kept for eggs, meat, and as "watch" animals. Conservation status varies by species — many geese are common and some populations have grown, while others face pressures, so status should be checked against current IUCN Red List data. Wild geese are wildlife; domestic geese are a separate, domesticated context.

Appearance & Recognition

Geese are large, heavy-bodied waterbirds with long necks (shorter than swans), webbed feet, and stout bills suited to grazing. Grey geese such as the greylag are largely grey-brown with an orange or pink bill, while black geese such as the Canada goose have dark necks and contrasting markings. Sexes generally look alike, unlike many ducks. Domestic geese are often larger and frequently white.

Similar Animals

Geese share the family Anatidae with ducks and swans. They are larger and longer-necked than ducks but shorter-necked than swans. The duck is a close relative covered separately on FaunaHub.

More photos of the goose

A white domestic goose standing on grass.

A domestic goose, descended from the wild greylag goose.

Image: Francesco Canu, CC BY-SA 3.0, via Wikimedia Commons.

Frequently Asked Questions — Goose

Why do geese fly in a V-formation?
Geese often migrate in V-formations. The leading birds create air movement that is thought to reduce the effort for those behind, helping the flock conserve energy over long distances, while the formation also helps the birds keep visual contact.
Are domestic geese the same as wild geese?
Most domestic geese descend from the wild greylag goose (some Asian breeds from the swan goose). Domestic breeds are often larger and may be white, and they are kept as poultry, while wild geese remain migratory wildlife. This page is a general overview, not care advice.
Why can geese be aggressive near their nests?
Geese form strong pair bonds and defend their nests and goslings vigorously. During the breeding season they may hiss, honk, and display to drive away perceived threats. Keeping a respectful distance from nesting geese is generally advised.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.