The house martin is a familiar summer visitor to British towns and villages, but its populations are declining as insect prey availability falls and traditional nesting sites are lost.
House martin decline is driven by the same agricultural intensification that affects other farmland insectivores - reduced aerial insect prey means birds work harder to feed themselves and their chicks. The additional loss of traditional building architecture that provided nest sites compounds the problem. Individual birds that fail to find sufficient food to rear chicks experience reproductive failure after significant energetic investment. Providing artificial nest cups and mud sources, combined with insect-friendly gardening and land management, can meaningfully improve welfare outcomes at a local scale.