A. Roëll

Social Behaviour of the Jackdaw, Cor Yus Moned Ula, in Relation To Its Niche

A. Roëll, 1978 .

A comparison of nest defence by Jackdaws, rooks, magpies and crows

A. Roëll, I. Bossema, 1982, Behavioral Ecology and Sociobiology.