The Horniest Male Beetles Have the Smallest Testicles.

Ah, the irony of nature: according to a new study by Douglas Emlen and Leigh Simmons, male beetles with the largest and most ostentatious set of horns apparently pay for it with smaller testicles!

Dung beetle research may be about to boost the cliché about men with flashy sports cars. According to new study, male beetles with the most dramatic and ostentatious sets of horns apparently pay for that with smaller testicles.

The research is one of the first studies to experimentally demonstrate that investing energy in one mating advantage may come at the expense of another.

Link - via Fortean Times