Page 180 - Demo

Chapter 8178AbstractIn some primate species, females show changes in proceptive behaviour across the menstrual cycle. This anecdotal report discusses the occurrence of ovulation-induced proceptivity and vocalisations in two zoo-housed Bornean orang-utan females. Observations of two individuals, Temmy and Eloise, during their peri-ovulatory periods revealed distinct behavioral patterns. While Temmy demonstrated male-seeking behaviour and vocalisation in response to playbacks of male long calls, Eloise consistently solicited the male she was housed with and proactively produced vocalisations during her ovulation. Interestingly, the vocalisations produced by Temmy and Eloise seem to differ in many aspects from known orang-utan calls, although they bear some similarities to male long calls. Thus, the vocal repertoire of female orang-utans may be more extensive than previously thought. We carefully suggest potential functions of female proceptivity calls, while also outlining how such calls could be detrimental for orang-utan females. Furthermore, we consider the possibility that these vocalisations are only present in captive orang-utan populations.Based on: Roth, T. S., von Wulffen, C., Fox, M., Askew, J., Spierings, M., Perea-García, J. O. Evidence of female proceptive behaviour and vocalisation during ovulation in two zoo-housed Bornean orang-utan (Pongo pygmaeus) females. Manuscript submitted for publication.Data availability statementThe datasets and materials generated and/or analysed during the current study are available via Dataverse: https://doi.org/10.34894/JNUTYUTom Roth.indd 178 08-01-2024 10:42