The ram as a model for behavioral neuroendocrinology. Oxytocin antagonist treatments alter the formation of pair relationships in zebra finches of both sexes. Ethology Ecology & Evolution, 11, 197–201. Induced homosexual behaviour in male house finches ( Carpodacus mexicanus): The “prisoner effect”. Homosexual behaviour in birds: frequency of expression is related to parental care disparity between the sexes. Same-sex sexual behavior in birds: Expression is related to social mating system and state of development at hatching. Avpr1a length polymorphism is not associated with either social or genetic monogamy in free-living prairie voles. Functional identification of sensory mechanisms required for developmental song learning. Oxytocin-like receptors mediate pair bonding in a socially monogamous songbird. Proceedings of Biological Sciences, 273, 3031–3038. Genetic models of homosexuality: Generating testable predictions. Behavioral Ecology and Sociobiology, 65, 2197–2208. Same-sex pair-bonds are equivalent to male–female bonds in a life-long socially monogamous songbird. Experimental evidence that female-female pairs in gulls result from a shortage of breeding males. An eye for detail: Selective sexual imprinting in zebra finches. Proceedings of the National Academy of Sciences, 97, 2282–2285. Localized neuronal activation in the zebra finch brain is related to the strength of song learning. Behavioral Ecology and Sociobiology, 27, 315–324. Extra-pair paternity and intraspecific brood parasitism in wild zebra finches Taeniopygia guttata, revealed by DNA fingerprinting. Trends in Ecology & Evolution, 24, 439–446.īirkhead, T. Animal Behaviour, 60, 47–53.Īdkins-Regan, E., & Tomaszycki, M. Removal of adult males from the rearing environment increases preference for same-sex partners in the zebra finch. Archives of Sexual Behavior, 31, 27–33.Īdkins-Regan, E., & Krakauer, A. Development of sexual partner preference in the zebra finch: A socially monogamous, pair-bonding animal. Furthermore, it is possible that females are more flexible in this choice of same-sex partnerships than are males.Īdkins-Regan, E. These findings suggest that same-sex partnerships in zebra finches can be facultative, based on the sex ratio of the group in which they live, but can also be a choice, when opportunities to pair with opposite-sex individuals are possible. Similarly, females were more likely to engage in pairing behaviors with males than with their partners or other females whereas males were equally likely to engage in same-sex and opposite-sex pairing behaviors. In contrast, some males did retain their partner. Females did not retain their partner, but most paired with males. We then gave pairs a chance to court and pair with members of the opposite sex and observed their behavior for three days. In a second experiment, we identified pairs from same-sex cages and selected 20 total same-sex pairs (10 of each sex). On average, 6.4 % ( N = 78) of unmanipulated pairs were same-sex: all but one was female–female. In the first experiment, we allowed zebra finches to pair in aviaries with equal sex ratios as part of multiple experiments. We examined same-sex behaviors using both semi-naturalistic choice paradigms and skewed sex ratios. Zebra finches form life-long monogamous relationships and extra pair behavior is very low, making them an ideal species in which to study same-sex pairing. This study examined flexibility and choice in same-sex pair-bonding behavior in adult zebra finches ( Taeniopygia guttata).
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