Sand martins are colonial cavity-nesting birds that depend on eroding riverbanks and sand quarries. Their welfare is closely tied to nesting site availability.
Sand martin welfare is primarily a nesting site issue. As obligate colonial cavity nesters, sand martins are entirely dependent on the availability of soft, vertical sandy banks - a habitat that has become increasingly scarce as river management has stabilised banks and removed natural erosion. Colonies disturbed during breeding cause nest abandonment and chick mortality - welfare harms affecting hundreds of birds in a single incident. Planning applications near river cliffs with sand martin colonies should be flagged to wildlife consultants. Artificial nesting facilities at restored gravel pits and river restoration projects that create natural eroding banks are the most welfare-positive long-term interventions. RSPB and Wildlife Trusts can advise on sand martin-friendly habitat creation.