The effect of excluding juveniles on apparent adult olive baboons (Papio anubis) social networks

“Friendship” with Males: A Female Counterstrategy to Infanticide in Chacma Baboons of the Okavango Delta

___–1 ___ 0 ___ +1 The fundamental conflict of reproductive interests between males and females, originally articulated by Trivers (1972) and Parker (1979), may have diverse evolutionary consequences at multiple levels: genetic, morphological, physiological , social, ecological, life historical (Arnqvist and Rowe 2005; Chapman 2006). This volume addresses one dramatic manifestation of this conf...

Olive baboons, Papio anubis, adjust their visual and auditory intentional gestures to the visual attention of others

Cue-reading by Olive Baboons in a Competitive Task

The ability of four olive baboons (Papio anubis) to use human gaze cues during a competitive task was investigated; the baboons were allowed to remove only the non-fixated one of two simultaneously presented food items. Three baboons successfully learned to exploit the human’s head orientation as a cue to obtain a food item, and one individual also learned to use eye direction alone. As the bab...

Impact of social environment on variation in menstrual cycle length in captive female olive baboons (Papio anubis).

Factors affecting menstrual cycles and conception were explored for captive female olive baboons. We evaluated the relationship between the social environment and adequacy of the menstrual cycle in 55 non-conceptive and 21 conception cycles from 23 females. More abnormal cycles were expected for low-status females, and social stress levels were associated with variation in menstrual cycle lengt...

Immigration and hybridization patterns of yellow and anubis baboons in and around Amboseli, Kenya.

In 1986, Samuels and Altmann reported evidence for a hybrid zone between Papio anubis and Papio cynocephalus in Amboseli, Kenya, in a baboon population that has been the subject of long-term study since 1971 [Samuels & Altmann, International Journal of Primatology 7:131-138, 1986]. In the current report we document ongoing patterns of hybridization in Amboseli between anubis and yellow baboons....