Boulogne sur Mer

The harbor of Boulogne-sur-Mer, France (50.727°N x 1.596°E) hosts a large urban breeding population (>1200 pairs) of black-legged kittiwakes (Rissa tridactyla) and is ideal for a study on migratory movements and wintering areas.

At Boulogne-sur-Mer, black-legged kittiwakes nest on various buildings, often at modest height (figure below), and are thus easily accessible and are the subject of a population survey led by the Centre d’Etudes Biologiques de Chizé (CEBC, O. Chastel) and the Groupe Ornithologique et Naturaliste du Nord – Pas-de-Calais (GON).