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SIBLING AGGRESSION IN THE BLACK EAGLE IN THE MATOPOS, RHODESIA

1978; Taylor & Francis; Volume: 49; Issue: 2 Linguagem: Inglês

10.1080/00306525.1978.9632631

1727-947X

Valerie Gargett,

Ecology and Vegetation Dynamics Studies

Summary Gargett, V. 1978. Sibling aggression in the Black Eagle in the Matopos, Rhodesia. Ostrich 49:57-63. A two-egg clutch of the Black Eagle Aquila verreauxii was observed from the hatching of the first chick to the death of the second. During its three day life the second hatched chick was pecked at least 1569 times in 38 sessions totalling 187 min in 34 h. Neither parent intervened. Comparisons are made between Matopos and Tanganyika observations on Black Eagles and between observations on sibling aggression in the Lesser Spotted Eagle Aquila pomarina where the second hatched chick lives longer and does not die directly from attack. No reason is known for this apparently wasteful behaviour.