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Articles 31 - 36 of 36
Full-Text Articles in Biological and Physical Anthropology
Infant Mortality After Takeovers In Wild Ethiopian Hamadryas Baboons, Larissa Swedell, Teklu Tesfaye
Infant Mortality After Takeovers In Wild Ethiopian Hamadryas Baboons, Larissa Swedell, Teklu Tesfaye
Publications and Research
In this paper, we report the first observational evidence of infanticide in wild hamadryas baboons. The study group inhabits the lowlands of the northern Rift Valley in Ethiopia and has been under observation for over 1200 hours, on and off, since October 1996. Here we report observations from August and September 2002 of the consequences of two takeovers of known females with black infants. After the first takeover, the respective infant disappeared and was presumed dead within eleven days of the takeover. After the second takeover, the infant incurred repeated severe aggression from its mother’s new leader male and eventually …
Affiliation Among Females In Wild Hamadryas Baboons (Papio Hamadryas Hamadryas), Larissa Swedell
Affiliation Among Females In Wild Hamadryas Baboons (Papio Hamadryas Hamadryas), Larissa Swedell
Publications and Research
Previous studies of hamadryas baboons have described a “star-shaped” sociogram, whereby the strongest social bonds within hamadryas one-male units are those between a leader male and his females and bonds among females are weak by comparison. This type of social organization has also been called “cross bonding” to distinguish it from the “female bonding” found in most papionin monkeys. Models of female primate socioecology have suggested that hamadryas baboons lack female bonding due to their reliance on scarce, widely-dispersed food resources. Here I report observational data from a wild population of hamadryas baboons in Ethiopia indicating that, while females varied …
Ranging Behavior, Group Size, And Behavioral Flexibility In Ethiopian Hamadryas Baboons (Papio Hamadryas Hamadryas)., Larissa Swedell
Ranging Behavior, Group Size, And Behavioral Flexibility In Ethiopian Hamadryas Baboons (Papio Hamadryas Hamadryas)., Larissa Swedell
Publications and Research
This study reports group size, home range size, daily path lengths, seasonal effects on ranging behavior and qualitative information on diet for a population of hamadryas baboons inhabiting the lowlands of the northern Rift Valley in central Ethiopia. The minimum home range size and daily path length for this population are similar to those reported for other populations of hamadryas baboons in Ethiopia and Saudi Arabia. Group sizes, however, are much larger than those in most other hamadryas populations for which published data are available. The large group sizes in this area may be related to the abundance of one …
Two Takeovers In Wild Hamadryas Baboons, Larissa Swedell
Two Takeovers In Wild Hamadryas Baboons, Larissa Swedell
Publications and Research
Hamadryas baboons exhibit a multi-level social structure in which several one-male units, each consisting of a ‘leader’ male and one or more females, comprise a band’ and two or more bands comprise a troop. Cohesion of each one-male unit is maintained by aggressive herding by its leader male [1]. Here I describe the consequences of 2 takeovers in a band of wild hamadryas baboons. I report evidence of infant mortality following takeovers, changes in female reproductive condition within 2 weeks after takeovers, and the reacquisition of a female by a deposed leader male, none of which has been previously reported …
Patterns Of Reconciliation Among Captive Gelada Baboons (Theropithecus Gelada), Larissa Swedell
Patterns Of Reconciliation Among Captive Gelada Baboons (Theropithecus Gelada), Larissa Swedell
Publications and Research
Animals that live in groups are frequently exposed to conflict situations and must in some way maintain group cohesion. One mechanism that appears to restore social relationships after they have been disrupted by conflict is reconciliation. This study investigated reconciliatory behavior in the gelada baboon, Theropithecus gelada. The subjects were 11 adult geladas, housed in a large outdoor enclosure at the Bronx Zoo/Wildlife Conservation Park, New York. Five-minute focal animal samples following spontaneous aggression were compared with 5-min matched-control samples. The results of this study were: (1) geladas reunited in a friendly way after aggression; (2) former opponents were attracted …
¿Los Restos Del Hombre De Pekín?, Aldemaro Romero Jr.
¿Los Restos Del Hombre De Pekín?, Aldemaro Romero Jr.
Publications and Research
No abstract provided.