Sand martins are the first swallow family member to arrive from Africa each spring. Their welfare depends on suitable sandy bank nesting sites and insect availability over water.
Sand martin welfare is primarily affected by the availability of suitable nesting banks and aerial insect prey. A colony established in a riverside bank that collapses before chicks fledge loses the entire breeding investment of potentially thousands of pairs. River engineering works that concrete riverbanks eliminate nesting habitat entirely. The expansion of artificial sand martin banks - simple structures with pre-drilled entrance holes in sandy substrate - represents one of conservation's most effective and straightforward welfare interventions: it creates appropriate habitat where natural sites have been eliminated, and monitoring shows high adoption rates by prospecting birds.