Reports

Gestation Period and Twinning in Chimpanzees

Science  10 Apr 1959:
Vol. 129, Issue 3354, pp. 959
DOI: 10.1126/science.129.3354.959

Abstract

The length of the gestation period in 118 births in a colony of chimpanzees was found to be 226.8 days, with a standard deviation of 13.3 and a range of 196 to 260 days. Six pairs of twins were born in 120 parturitions; thus the apparent twinning rate is higher than that in man.

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