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Nature 389, 440-441 (2 October 1997) | doi:10.1038/38891
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Postdoctoral Researcher
- Harvard University School of Public Health
- Boston, MA
Senior Research Associate ? Immunology
- Genentech
- South San Francisco, CA, USA
Evolutionary biology: Pelvic problems for mammals
Robert Presley1
Living mammals can be subdivided into the monotremes (which lay eggs), the marsupials (which nurture their young in a pouch) and the placentals (in which the young stay in the uterus until a comparatively late stage of development). Traditionally, the epipubis or so-called 'marsupial bone' has been associated with the suckling of young in a marsupial pouch: its absence from placental mammals supposedly reflected prolonged intrauterine development and birth at a stage when the individual could survive either in a nest or by keeping pace with the mother during lactation.
- Robert Presley is in the School of Molecular and Medical Biosciences, Cardiff University of Wales, PO Box 911, Cardiff CF1 3US, UK.
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