1. Social behaviour and communication in the great skua;Andresson;Behaviour,1976
2. An evaluation of the conflict hypothesis as an explanatory principle for the evolution of displays;Baerends,1975
3. A view of birds;Beer,1973
4. Observations and experiments on causation of threat displays in the great tit (Parus major);Blurton Jones;Anim. Behav. Monogr.,1978