Hip joint mobility in free-ranging rhesus macaques

Multiple sirehood in free-ranging twin rhesus macaques (Macaca mulatta).

Rhesus macaque females regularly copulate with a number of partners, and produce a single offspring per reproductive cycle in over 99% of cases. We used genotyping of 10 STR markers to determine paternity in the Cayo Santiago population of rhesus macaques. About 1,500 monkeys have been analyzed to date, with their marker genotypes entered into a computerized database. These data enable us to re...

Genetic influences on social attention in free-ranging rhesus macaques

An ethological approach to attention predicts that organisms orient preferentially to valuable sources of information in the environment. For many gregarious species, orienting to other individuals provides valuable social information but competes with food acquisition, water consumption and predator avoidance. Individual variation in vigilance behaviour in humans spans a continuum from inatten...

The energetics of maleemale endurance rivalry in free-ranging rhesus macaques, Macaca mulatta

Intended Receivers and Functional Significance of Grunt and Girney Vocalizations in Free-Ranging Female Rhesus Macaques

Animal behavioral signals can evolve by natural selection if the sender of the signal gains fitness benefits from the responses of others (e.g. Krebs & Davies 1993; Maynard Smith & Harper 2003). Demonstrating that behavior patterns have an adaptive communicative function requires rejecting the null hypothesis that there is no adaptive function, as well as the hypothesis that they are adaptive b...

Mother-infant interactions in free-ranging rhesus macaques: relationships between physiological and behavioral variables.

Studies of mother-infant relationships in nonhuman primates have increasingly attempted to understand the neuroendocrine bases of interindividual variation in mothering styles and the mechanisms through which early exposure to variable mothering styles affects infant behavioral development. In this study of free-ranging rhesus macaques on Cayo Santiago, Puerto Rico, we aimed to: 1) compare lact...