The sand martin is a colonial-nesting summer visitor that excavates burrows in sandy riverbanks and quarry faces, with welfare linked to nesting site availability.
Sand martin welfare at breeding sites depends on the availability and stability of suitable sandy banks. River management including bank reinforcement with hard materials destroys natural nesting habitat. Flooding of burrows causes nest failure and chick mortality. Predation by weasels, rats, and larger birds is a natural welfare pressure in colonies. Artificial sand martin banks at flooded gravel pits and wildlife reserves have compensated for some natural habitat loss. Maintaining water quality and insect abundance in river corridors supports feeding success for breeding adults.