Abstracts » Psychology and mental health

Lethal intergroup aggression by chimpanzees in Kibale National Park, Uganda

Article Abstract:

Two lethal coalitionary intergroup attacks on adult males at the Ngogo research site in Kibale, as well as severe attacks on an adult male and a juvenile male that were almost certainly fatal are described. It is suggested that lethal coalitionary aggression between groups is part of the natural behavioral repertoire of chimpanzees and is consistent with the 'food defense' hypothesis.

Uganda, Psychological aspects, Behavior, Aggressive behavior in animals, Animal aggression, Social behavior in animals, Animal social behavior, Animal social behaviour

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Proximity and estrous synchrony in Mahale Chimpanzees

Article Abstract:

The relationship between proximity and estrous synchrony is analyzed using data from wild female chimpanzees at Mahale, Tanzania. In the cycling females, two pairs were observed that spent large amount of time together and results showed that estrous synchrony indices of the high proximity pairs did not differ from those of other pairs.

Tanzania, Sexual behavior, Menstrual cycle, Animal communication, Scent marking

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