Notornis, 25 (2), 128-140
Article Type: Paper
Factors causing predation of the clam Paphies (Mesodesma ventricosa), the well-known ” toheroa,” by Black-backed gulls are described. Counts of Black-backed gulls made at approximately monthly intervals along a 23 kilometre stretch of beach between January 1970 and January 1971 and in December 1972, together with further observations between 1968 and 1975 show that Black-backed Gulls are important predators of toheroa.