送交者: AI 于 2006-1-24, 17:33:48:
Where the females are promiscuous, the males boasting the largest testicles also had the smallest brains. Conversely, where the females were faithful, the males had smaller testes and larger brains.
The study offers evidence that males make an evolutionary trade-off between intelligence and sexual prowess, said David Hoskens, a biologist at the Centre for Ecology and Conservation at the University of Exeter in England and a leading authority on bats' mating behavior.
http://news.yahoo.com/s/ap/20060124/ap_on_sc/bat_brains;_ylt=An3tLVJyCWIMk0cefIgtx74iANEA;_ylu=X3oDMTA3MzV0MTdmBHNlYwM3NTM-