Despite their modest size, these birds undertake extraordinary journeys, travelling more than 2,500 miles between breeding grounds in Arctic Siberia and wintering areas across north-west Europe, with the Solent hosting a globally important population.
By February, brent geese have spent several months recovering from migration and adjusting their physiology following temporary gut atrophy — a process in which digestive organs shrink before long-distance flight to reduce weight and improve efficiency. Once on wintering grounds, birds must gradually rebuild digestive capacity while feeding frequently, allowing them to process larger quantities of food over time.
As winter continues, the geese continue to feed and rest across the coastline, building vital energy reserves ahead of their spring migration. This period is one of the most important stages in the birds’ annual cycle, and marks a shift from recovery to preparation. Increasing daylight and subtle hormonal changes trigger birds to accumulate fat stores needed for migration and breeding. Access to reliable feeding areas and undisturbed roost sites is therefore essential if birds are to depart in good condition.
Our coastlines offer an ideal network of habitats to support this process. Mudflats and saltmarsh provide eelgrass and algae, while nearby grazing marshes and coastal fields supply grasses that form a key part of the geese’s diet. Sites including Keyhaven Marshes support hundreds of birds within an extensive area of foreshore managed for wildlife, acting as crucial refuelling stations before the birds begin their return journey north.
Brent geese are highly social, feeding in tight flocks and moving between feeding and roosting areas with the tides. This daily rhythm is finely balanced, and disturbance that causes birds to fly unnecessarily can interrupt feeding opportunities and deplete the energy reserves they are actively building.
With migration only weeks away, the continued presence of brent geese along our shorelines highlights the international importance of our two counties coastal habitats and the role they play in supporting migratory wildlife throughout the year.