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Science 5 September 1975:
Vol. 189. no. 4205, pp. 813 - 814
DOI: 10.1126/science.1162356
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Articles

Science, Vol 189, Issue 4205, 813-814
Copyright © 1975 by American Association for the Advancement of Science

articles

Sexual cyclicity in captive lowland gorillas

RD Nadler

Oppositely sexed pairs of gorillas exhibit some behavior indicative of higher cognitive functioning, such as individual partner preferences and varied copulatory positions, but also mate in a cyclic manner closely related to the degree of female genital swelling. The latter finding is contrary to predictions based on their advanced position in phylogeny.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)