Branta bernicla
Britain's smallest and most coastal goose, rarely seen far from the tideline.
Size: 55-66 cm | Habitat: Sea, Marsh, Estuary & Shoreline Birds | Season: Winter visitor
Barely bigger than a mallard, the dark-bodied brent goose is the smallest and most maritime of Britain's geese, almost never straying from estuaries and saltmarsh. Dense, chattering flocks feed on eelgrass and seaweed exposed at low tide.
Black head, neck and breast with small white neck patch · dark grey-brown belly · small stubby black bill · smallest UK goose
Brent geese feed almost entirely on eelgrass and seaweed on estuary mudflats and saltmarsh, moving in dense, constantly chattering flocks. They are far more tied to the coast than any other British goose.
Breeding success is decided thousands of miles away in Arctic Siberia — when lemmings are plentiful, Arctic foxes eat lemmings instead of goose eggs, so far more brent goslings survive that year.
The Brent Goose (Branta bernicla) is Britain's smallest and most maritime goose, barely bigger than a mallard, dark-bodied with a small white neck patch, almost never found away from estuaries and saltmarsh.
Brent geese feed almost exclusively on eelgrass and seaweed exposed on estuary mudflats at low tide, moving in dense, constantly chattering flocks between feeding grounds. Remarkably, their breeding success each year is largely decided thousands of miles away on the Siberian tundra: in years when Arctic lemming populations are high, Arctic foxes prey on lemmings rather than goose eggs and chicks, so far more goslings survive to migrate south.
UK brent goose numbers crashed dramatically in the mid-20th century due to a disease that wiped out much of their eelgrass food supply, but have recovered strongly since, illustrating how closely this species' fortunes are tied to conditions in habitats it never even visits.
🟠 Conservation status: Amber (UK Birds of Conservation Concern 5)
Amber-listed, reflecting the UK's international importance for wintering flocks and continued reliance on a small number of key estuary sites, despite a strong recovery from a mid-20th-century population crash.