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Individual and Seasonal Variation in Fecal Testosterone and Cortisol Levels of Wild Male Tufted Capuchin Monkeys, Cebus apella nigritus
This study tested the "challenge hypothesis" and rank-based predictions for temporal steroid production in male tufted capuchin monkeys, Cebus apella. Fecal samples (n = 209) collected from six wildExpand
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Do food availability, parasitism, and stress have synergistic effects on red colobus populations living in forest fragments?
Identifying factors that influence animal density is a fundamental goal in ecology that has taken on new importance with the need to develop informed management plans. This is particularly the caseExpand
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Early experience in humans is associated with changes in neuropeptides critical for regulating social behavior.
The formation of social attachments is a critical component of human relationships. Infants begin to bond to their caregivers from the moment of birth, and these social bonds continue to provideExpand
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Oxytocin: behavioral associations and potential as a salivary biomarker.
Oxytocin (OT) is a neuropeptide that is produced primarily in the hypothalamus and is best known for its role in mammalian birth and lactation. Recent evidence also implicates OT in social behaviors,Expand
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The Relationship of Cortisol Levels to Social Environment and Reproductive Functioning in Female Cotton-Top Tamarins, Saguinus oedipus
Cortisol levels were examined in 17 cotton-top tamarin monkeys (Saguinus oedipus) to determine: (1) if first-morning void urine sampling could be used as a noninvasive method for monitoring cortisolExpand
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Food sharing is linked to urinary oxytocin levels and bonding in related and unrelated wild chimpanzees
Humans excel in cooperative exchanges between unrelated individuals. Although this trait is fundamental to the success of our species, its evolution and mechanisms are poorly understood. Other socialExpand
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Hormones Associated with Non-Maternal Infant Care: A Review of Mammalian and Avian Studies
  • T. Ziegler
  • Biology, Medicine
  • Folia Primatologica
  • 17 February 2000
Hormonal changes during non-maternal infant care have been demonstrated in many cooperatively breeding bird species, some monogamous rodents and two species of New World primates. Coevolution ofExpand
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Variation in oxytocin is related to variation in affiliative behavior in monogamous, pairbonded tamarins
Oxytocin plays an important role in monogamous pairbonded female voles, but not in polygamous voles. Here we examined a socially monogamous cooperatively breeding primate where both sexes share inExpand
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Fecal steroid research in the field and laboratory: improved methods for storage, transport, processing, and analysis
Since the pioneering paper “Measurement of Excreted Steroids in Macaca nemestrina” [Risler et al., American Journal of Primatology 12:91–100, 1987] was first published, field primatologists have beenExpand
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Urinary oxytocin and social bonding in related and unrelated wild chimpanzees
Animals that maintain cooperative relationships show gains in longevity and offspring survival. However, little is known about the cognitive or hormonal mechanisms involved in cooperation. Indeed,Expand
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