Feeding territories and breeding success of South Polar skuas
In: The Auk, Jg. 95 H. 1, S. 23-33
Female aggression and male peace-keeping in a cichlid fish harem: conflict between and within the sexes in Lamprologus ocellatus
In: Behavioral Ecology and Sociobiology, Jg. 34 H. 2, S. 105-112First observations on colony structure, behavior and vocal repertoire of the South American fur seal (Arctocephalus australis, Zimmermann 1783) in Peru
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In: Behavioral Ecology and Sociobiology, Jg. 18 H. 4, S. 259-266