Solitary pairs of Great Black-backed Gulls Larus marinus prevent strangers from mobbing a predator model at their nest site

Kilpi, M. (1989). Solitary pairs of Great Black-backed Gulls Larus marinus prevent strangers from mobbing a predator model at their nest site. Ornis Fennica, 66(2), 77–79. Noudettu osoitteesta https://ornisfennica.journal.fi/article/view/133280