Red-breasted Goose

The red-breasted goose (Branta ruficollis) is one of the smallest and most distinctive geese. It measures about 53–56 cm and weighs roughly 1.0–1.6 kg, with males averaging larger than females.

The head, back and belly are black, sharply patterned with white facial and flank markings and rich chestnut-red cheeks, neck and breast. The short bill and compact body distinguish it from the related barnacle goose (Branta leucopsis) and brent goose (Branta bernicla).

Breeding takes place on Arctic tundra and along low river valleys of the Taymyr, Gydan and Yamal peninsulas in Siberia. Nesting areas are generally open, treeless landscapes with riverbanks, slopes and dry tundra close to feeding areas.

During migration and winter the species depends on a combination of open farmland and secure wetlands. Coastal lagoons, lakes and reservoirs provide roosting sites, while surrounding grassland and cereal fields supply much of the food.

The diet is almost entirely plant-based. Breeding birds eat tundra grasses, sedges and other low vegetation, while migrating and wintering birds take grasses, leaves, shoots, winter cereals and other agricultural plants.

Red-breasted geese feed mainly by grazing and cropping leaves and shoots from low vegetation, often in compact flocks on grassland and cereal fields. Feeding is mainly diurnal, but birds may continue after dark where daytime disturbance is high.

Red-breasted geese are long-distance migrants. After breeding in Arctic Siberia they travel south through Russia and Kazakhstan toward the Black Sea region, with the main wintering concentrations in southeastern Europe.

A study published in 2024 using satellite-tracked birds showed that individuals depend on a chain of stopover areas rather than travelling directly between breeding and wintering grounds. The exact routes and length of stays vary with weather, disturbance and food availability, making coordinated protection across several countries along the flyway essential.

The wintering distribution has changed substantially since the 1960s. Much of the population formerly wintered along the western Caspian Sea, but major changes in agriculture were followed by a westward shift, and the main wintering areas are now around the western Black Sea.

Outside the breeding season the species is highly social and forms large flocks, often mixing with greater white-fronted geese and other grazing waterfowl. Birds commute collectively between feeding fields and secure roosts and can become concentrated at a relatively small number of important sites.

This flocking behaviour can improve vigilance and allows birds to follow others to productive feeding areas, but it also means that disturbance or hunting pressure at one major roost or feeding area can affect a substantial fraction of the population at once.

In the Arctic, red-breasted geese often nest in small loose colonies close to the territories of large birds of prey such as peregrine falcons (Falco peregrinus), snowy owls (Bubo scandiacus) and rough-legged buzzards (Buteo lagopus). These birds defend their own nests and can deter Arctic foxes and other mammalian predators, indirectly improving safety for nearby geese.

River islands are also used as nesting sites. A study published in 2003 found consistently high breeding success in colonies at cliffs with peregrine falcons, while both nest numbers and breeding success on river islands varied more between years. This shows how strongly the species' choice of nesting site is tied to protection from mammalian predators.

The female lays about three to eight eggs and incubates for roughly 24–27 days while the male remains nearby. Families leave the nest soon after hatching, and the young normally become capable of flight in late August or early September.

The red-breasted goose is classified as vulnerable on the IUCN Red List. The population is relatively small and highly concentrated geographically during breeding, migration and winter.

Population counts can fluctuate substantially because flocks shift between countries and roosts, making coordinated international monitoring particularly important.

Important threats include illegal and accidental shooting, disturbance at feeding and roosting sites, conversion of grassland and wetlands, changes in agricultural practices, poisoning, collisions with power lines and poorly placed energy infrastructure.

Because much of the population uses the same limited network of sites, local changes can have effects far beyond a single country.

The species is the subject of coordinated international conservation under AEWA. A dedicated Red-breasted Goose International Working Group supports implementation of the single-species action plan and is coordinated by the Wildfowl & Wetlands Trust in cooperation with the Bulgarian Society for the Protection of Birds.

Priorities include reducing hunting mortality, protecting key breeding, stopover and wintering sites and improving international population monitoring. Recent telemetry work is also helping identify the places and migration corridors where protection can benefit the greatest proportion of the population.

The red-breasted goose is a very rare vagrant in Norway. BirdLife Norway noted in 2020 that only 24 records were known up to and including 2015, five of which were considered likely escapes from captivity. When one appeared among barnacle geese at Fornebu in April 2019, it was therefore a genuinely exceptional sighting.

I saw the bird on 22 April during BirdLife Norway's annual Easter birding trip. It was my first—and remains my only—red-breasted goose. The excitement was initially tempered by its unusually tame behaviour, which raised the possibility that it had escaped from captivity.

The goose was later captured and ringed, and feathers were analysed using stable isotopes. The results indicated that the feathers had most likely grown in the species' Siberian breeding range rather than in captivity in western Europe. That gave the observation a very different significance: this was, in all likelihood, a genuine long-distance vagrant that had reached Fornebu on its own. It remains one of my most special and memorable bird sightings in Norway.