Journal
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
Volume 70, Issue 4, Pages 459-466Publisher
SPRINGER
DOI: 10.1007/s00265-015-2053-3
Keywords
Orangutan; Lethal aggression; Coalitionary attack; Female-female competition; Male support
Categories
Funding
- University of Zurich
- A.H. Schultz-Stiftung zur Forderung Primatologischer Forschung
- United States Agency for International Development (USA) [APS-497-11-000001]
- Philadelphia Zoo
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Female Bornean orangutans (Pongo pygmaeus wurmbii) are mainly solitary and philopatric, leading to adult female relatives sharing adjacent and overlapping home ranges. Females tend to be intolerant of unrelated females, with whom they also may have overlapping home ranges. However, fights that lead to injuries are extremely rare and lethal aggression had never been observed. Here, we report the first case of lethal female-female aggression during over 26,000 h of focal data collected on adult females at Tuanan, Central Kalimantan: A young female, who had recently lost her infant, attacked an old resident female. The interaction's unique feature was that the attacking female was supported by an unflanged male, who had been in consort with her during the week preceding the attack and was responsible for the lethal injuries to the victim. The victim received protection from a flanged male who was probably attracted to the noise generated by the fight. We conclude that even in a species in which coercion is frequently observed in male-female interactions, female leverage over males can coax males into providing services, such as coalitionary support.
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