Scientists have found that in bat species with promiscuous females, male bats have larger testes and smaller brains, compared to in bat species with monogamous females, where male bats have smaller testes but larger brains, the AP reported earlier this week.
"The male who ejaculates the greatest number of sperm wins the game, and hence many bats have evolved outrageously big testes," says this biologist dude.
C'mon human males, get in the balls-game! I wanna play!