In 1991 and 1992 Common and Arctic Terns differed in chick-feeding and
chick-rearing strategies. Arctic Terns favoured smaller prey, primari
ly crustaceans, for feeding their chicks than did Common Terns. Conseq
uently, Arctic Tern feeding rates were higher. The influence of the ti
de on food parameters was greater in Arctic Terns. In both years breed
ing success was better in Common Terns.