Little terns nest colonially on open shingle beaches and are among the most vulnerable UK breeding seabirds to human disturbance.
Little tern welfare during breeding is acutely sensitive to disturbance. Ground nests on open beaches are invisible to recreationists who may unknowingly walk through colonies. Repeated disturbance prevents incubation, chilling eggs and chicks. Individual birds disturbed repeatedly lose condition through energy-costly alert and escape flights. Volunteer wardening creates welfare-positive zones around colonies, dramatically improving breeding success. Each disturbance event represents a direct welfare impact on individual incubating birds.