Whimbrels are medium-sized waders that use UK estuaries and coastal grasslands as stopover sites during their spring migration from Africa to Arctic breeding grounds. Their welfare depends on refuelling habitat quality.
Whimbrel welfare during spring migration is critically dependent on refuelling habitat quality at UK stopover sites. Birds arriving from West African wintering grounds are depleted and must rapidly accumulate fat reserves for the final leg to Arctic breeding grounds. Estuarine mudflats with abundant crabs and polychaetes are ideal refuelling habitats; degraded estuaries with reduced invertebrate communities force longer stays with greater predation risk. Spring arrival timing must align with breeding ground conditions: birds that arrive at tundra before snow melts cannot access food, but those that arrive after peak invertebrate abundance find reduced prey for chick feeding. Human disturbance at key spring passage sites reduces feeding efficiency and forces birds to expend energy on avoidance flights at a time when energy is critically needed.