Emperor goose, Beach goose, Painted goose
The emperor goose (Anser canagicus ), also known as the beach goose or the painted goose, is a waterfowl species in the family Anatidae, which contains the ducks, geese, and swans. It is blue-gray in color as an adult and grows to 66–71 centimetres (26–28 in) in length. Adults have a black chin and throat, a pink bill, yellow-orange legs, and a white head, which often turns reddish-brown in summer. In the winter, the emperor goose lives in mudflats and coasts in Alaska and occasionally Canada and the contiguous United States. In the summer, it migrates northerly several hundred miles to arctic and sub-arctic climates, where older individuals breed monogamously. Nests are constructed in holes and built up with vegetation and feathers. Eggs hatch in late June and early July, and goslings leave the nest the day they hatch. The species is an omnivore, and makes vocalizations that are more nasal than those of other geese. Listed as near threatened by the International Union for Conservation of Nature, the species' population is declining due to threats such as pollution, hunting, and climate change.
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DiurnalDiurnal animals are active during the daytime, with a period of sleeping or other inactivity at night. The timing of activity by an animal depends ...
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HerbivoreA herbivore is an animal anatomically and physiologically adapted to eating plant material, for example, foliage, for the main component of its die...
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FolivoreIn zoology, a folivore is a herbivore that specializes in eating leaves. Mature leaves contain a high proportion of hard-to-digest cellulose, less ...
An omnivore is an animal that has the ability to eat and survive on both plant and animal matter. Obtaining energy and nutrients from plant and ani...
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TerrestrialTerrestrial animals are animals that live predominantly or entirely on land (e.g., cats, ants, snails), as compared with aquatic animals, which liv...
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SemiaquaticSemiaquatic animals are those that are primarily or partly terrestrial but that spend a large amount of time swimming or otherwise occupied in wate...
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WaterfowlWaterfowl are certain wildfowl of the order Anseriformes, especially members of the family Anatidae, which includes ducks, geese, and swans. They ...
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GrazingGrazing is a method of feeding in which a herbivore feeds on plants such as grasses, or other multicellular organisms such as algae. In agriculture...
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PrecocialPrecocial species are those in which the young are relatively mature and mobile from the moment of birth or hatching. Precocial species are normall...
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NatatorialNatatorial animals are those adapted for swimming. Some fish use their pectoral fins as the primary means of locomotion, sometimes termed labriform...
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TerritorialA territory is a sociographical area that which an animal consistently defends against the conspecific competition (or, occasionally, against anima...
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CongregatoryCongregatory animals tend to gather in large numbers in specific areas as breeding colonies, for feeding, or for resting.
Oviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive...
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MonogamyMonogamy is a form of relationship in which both the male and the female has only one partner. This pair may cohabitate in an area or territory for...
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FlockingFlocking birds are those that tend to gather to forage or travel collectively. Avian flocks are typically associated with migration. Flocking also ...
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ColonialColonial animals live in large aggregations composed of two or more conspecific individuals in close association with or connected to, one another....
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MigratingAnimal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. It is the most common form of migrati...
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starts withOne of North America's rarest geese, the Emperor goose is small and stocky, with dark bluish-gray feathers and black barring on its upper parts. Male and female are similar, the female being slightly smaller than the male. Juveniles have a slightly duller coloring than the adults, having brown barring on their upper parts, gray mottling on their head and foreneck, olive-brown legs, and a black bill.
Emperor geese have a range which centers on the North Pacific Ocean in the Bering Sea. They breed in sub-Arctic and Arctic Alaska and along Russia's north-eastern coast. Most of the population winters along the Aleutian Islands' coasts, but may also winter in the Alaskan Peninsula and Canada. They inhabit open sites in arctic tundra during the mating season, either near inland lakes, coastal lagoons, or freshwater pools. In winter, they are mainly found on ice-free coasts.
Emperor geese in their wintering or nesting areas are relatively sedentary. Particularly when nesting, the pairs have little to do with other birds, except for defensive behavior if some other goose comes too close. During the non-migration seasons, emperor geese swim or walk much more often than they fly. They are diurnal and usually feed in their family groups, but in winter they gather in big flocks for molting. The mating adults molt in areas relatively nearby their breeding grounds, while the non-mating birds gather in large flocks at several other sites. The typical threatening actions of the emperor goose include bowing, head-jerking, and wing-flapping. The female will defend only the nest site, doing so aggressively in the postures she adopts and uttering loud calls.
In the summer, the diet of Emperor geese consists of vegetation, such as shoots, roots, and berries, while in the winter they primarily eat bivalve mollusks, which they use their sense of touch to catch, and algae.
Emperor geese are monogamous and will form a new bond only if their previous mate dies. Late May to early June is the period of the breeding season. They breed in loose colonies. Females select their nest site amongst low vegetation to have better visibility, and they build the nest on the ground, which is a shallow depression. It is lined with grass, down, and feathers. Males do not participate in nesting duties but remain nearby to defend the nest and the family against intruders. 1-8, but more commonly 5 creamy-white eggs are laid. The female incubates on her own for 24-25 days. The chicks are precocial, usually leaving the nest on their first day of life. They can walk and swim within hours. Goslings fledge about 50-60 days after hatching and become mature at 2-3 years of age.
The Emperor goose is threatened by hunting in Russia and coastal oil pollution. Habitat loss in the tundra as a result of climate change may impact negatively on this species in the very nearest future.
According to the IUCN Red List, the total population size of Emperor geese is estimated to number 85,000 individuals, while the population in Russia has been estimated at 100-10,000 breeding pairs. This species' numbers are decreasing today and it is classified as near threatened (NT) on the IUCN Red List.
In their consumption of mollusks, Emperor geese impact those populations significantly. It is thought that by grazing they increase the growth of vegetation in their habitat, therefore probably benefiting many organisms in the area that use vegetation for cover or food.
Social animals are those animals that interact highly with other animals, usually of their own species (conspecifics), to the point of having a rec...