The grey plover is a winter visitor to UK estuaries from Siberian breeding grounds. In breeding plumage it is spectacular — jet black below, silver above — but UK visitors are seen in dull grey winter dress.
Grey plover welfare at wintering estuaries depends on territorial access to invertebrate-rich mudflats. As a solitary feeder that defends individual patches, grey plover welfare is affected by habitat reduction that increases competition for feeding territories. Disturbance that flushes birds from defended areas disrupts feeding and may allow competing birds to occupy the territory. Climate change altering the distribution and abundance of Nereis worms and other large mudflat invertebrates affects food availability. Birds maintaining winter territories on high-quality estuaries show better body condition than birds on degraded sites — supporting the welfare case for estuarine habitat protection.