Brent goose – Branta bernicla
is a species of goose of the genus Branta. The brant is a small goose with a short, stubby bill. It measures 55–66 cm (22–26 in) long, 106–121 cm (42–48 in) across the wings and weighs 0.88–2.2 kg (1.9–4.9 lb).[3][4][5] The under-tail is pure white, and the tail black and very short (the shortest of any goose). It used to be a strictly coastal bird in winter, seldom leaving tidal estuaries, where it feeds on eel-grass (Zostera marina) and the seaweed, sea lettuce (Ulva). On the east coast of North America, the inclusion of sea lettuce is a recent change to their diet, brought about by a blight on eelgrass in 1931. This resulted in the near-extirpation of the brant. The few that survived changed their diet to include sea lettuce until the eelgrass eventually began to return. Brants have maintained this diet ever since as a survival strategy.[6] In recent decades, it has started using agricultural land a short distance inland, feeding extensively on grass and winter-sown cereals.

It sounds like this
recording by Peter Boesman from Xeno canto