Evolutionary biologist Olivia Judson speculates about the

Evolutionary biologist Olivia Judson speculates about the Tyrannosaurus rex’s sexual equipment.

We now have a robust understanding of how sexual pressures — the pressures to find, impress, and seduce a mate — influence the evolution of males and females. So much so that if you tell me a fact, such as the average size difference between males and females in a species, or the proportion of a male’s body taken up by his testes, I can tell you what the mating system is likely to be. For example, where males are much bigger than females, fighting between males has been important - which often means that the biggest males maintain a harem. If testes are relatively large, females probably have sex with several males in the course of a single breeding episode.

(thx, bill)

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• sex