The sand martin is the earliest summer migrant to return to Britain in spring, excavating nest tunnels in sandy riverbanks and sand quarries, with its welfare tied to the dynamic erosion processes that create suitable nesting habitat.
Sand martin welfare on British breeding grounds depends on the availability of freshly eroded sandy banks that provide clean, pest-free nesting material. River management that prevents natural bank erosion through armoured revetments eliminates nesting habitat. Sand and gravel quarry faces provide alternative sites but require careful management to avoid disturbance during the breeding season. Sahel drought has caused dramatic population crashes and remains the primary long-term welfare risk.