Emperor Goose (Anser canagicus)

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Image of a Emperor goose
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Introduction

The Emperor Goose, Anser canagicus, is a compact Arctic goose of coastal Alaska and the Russian Far East. It is strongly associated with Bering Sea shorelines, tundra wetlands, mudflats and ice-free coastal habitats. The species is recognised by its blue-grey body, white head and hindneck, dark throat and bright orange legs. The current IOC World Bird List places it in the genus Anser, although older sources may use the name Chen canagica. (ww.worldbirdnames.org)

Physical Description

The Emperor Goose is a stocky, short-necked goose measuring approximately 66–76 cm in length, with a wingspan of about 122–142 cm. Adults usually weigh around 2.8 kg, although mass varies with sex, season and condition. The sexes are similar in appearance, with males generally only slightly heavier than females. (adfg.alaska.gov)

Adults have a blue-grey body with black-and-white feather edging that gives the plumage a finely scaled appearance. The head and hindneck are white, the chin and throat are black, the bill is short and pink to pinkish-lavender, and the legs and feet are bright orange. The white head can become stained rusty orange when birds feed in iron-rich coastal sediments. The tail is white and contrasts with the darker body and undertail area. (allaboutbirds.org)

Juveniles are duller and more heavily mottled. They have a darker bill, dull yellow-orange legs and grey-brown or sooty markings on the head and neck rather than the clean white pattern of adults. Their body plumage is also less crisply barred. (allaboutbirds.org)

Range and Habitat

The Emperor Goose breeds mainly along the coastal tundra of western and northern Alaska, especially around the Yukon-Kuskokwim Delta. Smaller breeding populations occur along the north-western Alaskan coast and in the Russian Far East, including the Chukotka Peninsula. The species is largely endemic to the Bering Sea region. (adfg.alaska.gov)

Breeding birds use low coastal tundra, salt marshes, wet moss-sedge areas, river margins, ponds and sloughs. Nests are generally placed on the ground in slightly raised or well-drained sites with sufficient vegetation and a clear view of approaching predators. Many nesting areas are within roughly 16 km of the coast. (adfg.alaska.gov)

The species undertakes relatively short-distance migrations compared with many Arctic geese. Most birds move south in late summer and autumn to winter in ice-free coastal areas of the Aleutian Islands, the Alaska Peninsula and the Kodiak Archipelago. Small numbers may occur farther south along the Pacific coast, including occasional records in the contiguous United States. (adfg.alaska.gov)

Behaviour and Diet

Emperor Geese are generally less gregarious than many other geese. They often remain in family groups and may forage among Cackling Geese, Snow Geese and Brant, but breeding pairs defend nesting territories and feeding areas from other geese. Pair bonds are strong and are commonly maintained over successive years. (allaboutbirds.org)

Their diet changes with location and season. On the breeding grounds, they feed mainly on roots, bulbs, shoots, grasses, sedges and other tundra vegetation. Berries may also be taken in late summer and autumn. During migration and winter, they forage in intertidal habitats, eating marine algae, eelgrass and other plants, as well as clams, mussels, barnacles and other small marine invertebrates. (audubon.org)

Breeding usually begins soon after birds reach the nesting grounds. The female builds the nest and incubates the eggs, while the male remains nearby and provides much of the nest defence. A typical clutch contains about three to five eggs, although larger clutches have been recorded. Incubation lasts approximately 24–25 days. Goslings are downy, mobile soon after hatching and are cared for by both parents. They generally become capable of flight at about 50–60 days of age. (allaboutbirds.org)

Identification Tips

Look for the following combination of features:

  • A small, compact and round-bodied goose with a short neck and short bill.
  • A blue-grey body with a finely barred or scaled appearance.
  • A contrasting white head and hindneck in adults.
  • A black chin and throat.
  • Bright orange legs and feet.
  • A white tail that remains conspicuous in flight.

The white-headed adult pattern is distinctive among regularly occurring geese of the Bering Sea region. Immature birds are more difficult to identify because their heads and necks are grey-mottled rather than clean white. Their small bill, compact shape, dark-and-silver body pattern and white tail help separate them from similarly sized geese. The Emperor Goose is smaller and more compact than a Greater White-fronted Goose, but larger than a Brant. (allaboutbirds.org)

Conservation Status

The Emperor Goose is currently assessed as Near Threatened on the IUCN Red List. The species has a restricted breeding and wintering range, and historical surveys recorded a substantial decline in Alaska between the 1960s and the 1980s. Later monitoring indicated recovery in some periods, but population assessment remains dependent on regular aerial surveys and other management data. (cms.int)

Important conservation concerns include the vulnerability of concentrated coastal populations to habitat alteration, climate-related changes, pollution and oil spills, disturbance, and poorly managed harvest. Because the species crosses international boundaries between Alaska and Russia, effective conservation requires cooperation among government agencies, Indigenous communities, researchers and conservation organisations. Measures include population monitoring, protection of breeding and wintering habitat, regulation of harvest and continued study of migration and habitat use. (explorer.natureserve.org)

Frequently Asked Questions

Where does the Emperor Goose live?

It breeds mainly in coastal Alaska, especially the Yukon-Kuskokwim Delta, with smaller populations in north-western Alaska and the Russian Far East. It winters mostly along ice-free coasts of the Aleutian Islands, the Alaska Peninsula and Kodiak Island.

What does an Emperor Goose look like?

An adult has a blue-grey, finely patterned body, a white head and hindneck, a black throat, a short pinkish bill and bright orange legs. Juveniles are duller, with grey-mottled heads and darker bills.

What does the Emperor Goose eat?

It eats tundra vegetation, including roots, bulbs, shoots, grasses and sedges. During migration and winter, it also feeds on marine algae, eelgrass, clams, mussels, barnacles and other intertidal foods.

How many eggs does an Emperor Goose lay?

A typical clutch contains three to five eggs. The female incubates them for about 24–25 days, while the male helps defend the nest and territory.

Is the Emperor Goose endangered?

It is not currently classified as Endangered, but it is listed as Near Threatened. Its restricted range, historical population decline, coastal habitat dependence and exposure to harvest, pollution and environmental change remain conservation concerns.

Is Chen canagica the same bird as Anser canagicus?

Yes. Chen canagica is an older or alternative scientific combination. The current IOC World Bird List uses Anser canagicus for the Emperor Goose.

References

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