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Difference in sex vocalizations

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Andrew, I see you have identified birds to sex on this and another recording from this site. How did you sex them? Was it visually ie, did the pair copulate? Or is it based on the vocalizations following the Kroodsma character of longer, more quavering terminal note being indicative of female? If the former, it'd be helpful if you noted this explicitly, but if the latter, I'd stick the word 'presumed' in front, since you do not know the bird's sex for certain. I did it based on the pitch of the vocalizations I've been told by various people mostly about Spotted Owls, but also about others that males are distinctly lower pitched than female owls.
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Geyer [Am. We tested these hypotheses by recording ultrasonic vocalizations USVs and coordinated movements locomotion and grooming in California mouse and by recording USVs from pups before and after their parents retrieved them. In Experiment 1, USVs and coordinated movements were recorded from 2 to 30 days of age, in female and male Peromyscus californicus pups.
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Female copulatory vocalizations , also called female copulation calls or coital vocalizations , are produced by female primates , including human females , and female non-primates. Copulatory vocalizations usually occur during copulation and are hence related to sexual activity. In primates , copulation calling is typically observed at the end of mating [2] and there are vast variations between species regarding its occurrence, frequency and form.
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