Human Evolution

, Volume 2, Issue 6, pp 547–555 | Cite as

Twinning frequency in catarrhine primates

  • T. Geissmann


It has been repeatedly suggested that twinning frequency in most catarrhine primates is approximately the same as in humans, whereas the frequency in the chimpanzee and the gorilla might be higher. This study presents a re-evaluation of the evidence from the pertinent literature. It can be demonstrated that most data on twinning frequency in Old World monkeys and apes should not be used because of their small sample size. A lower limit of 1500 pregnancies is suggested here. If all frequency estimates taken from smaller samples are rejected, only four estimates forMacaca mulatta andPapio hamadryas remain. The estimates range from 0.19 to 0.35% and are in fact lower than the frequencies of most (but necessarily all) human populations. The published birth samples for apes are, however, relatively small, and the resulting twinning rates may not be reliable.

Key words

Twins Twinning frequency Multiple births Primates Catarrhini 


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Copyright information

© Editrice II Sedicesimo 1987

Authors and Affiliations

  • T. Geissmann
    • 1
  1. 1.Anthropological InstituteUniversity Zürich-IrchelZürichSwitzerland

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