These geese once only fed along the coast, feeding on eel-grass and sea lettuce but in recent years they have begun eating grass and cereals from near-by agricultural land.
A small, dark goose, the light-bellied brent goose has a black head and neck and grey-brown back, with a pale belly. Adults have a small white neck patch. It flies in loose flocks along the coast, rather than in tight skeins like grey geese. They can often be seen forming large colonies.