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Nature 444, 689-692 (7 December 2006) | doi:10.1038/444689a; Published online 6 December 2006
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Scientist for Adrenal Research
- University of Dresden, Dept. of Medicine, Director: Prof. S. Bornstein
- Dresden 01307 Germany
Chair
- McMaster University
- Hamilton, Canada
Evolutionary biology: Caught right-handed
A. Richard Palmer1
Abstract
Are two penises better than one? Not so, implies a study of doubly endowed earwigs. An ancestral behavioural preference for the right penis might have facilitated the loss of the left in species that arose later.
Human males may sometimes wonder about the size of their penis, but they rarely fret about which one to use. Not so for many arthropods, among them fairy shrimp1, dragonflies2 and spiders3, some of which face a delicate choice before each tryst: "Left or right tonight?
- A. Richard Palmer is in the Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E9 Canada.
Email: rich.palmer@ualberta.ca
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