The Bigger Your Weapon, The Smaller Your Balls – If You’re A Beetle
To compete for mates, male beetles often grow fierce mandibles that they use to fight other males. Unfortunately, there’s a tradeoff. Researchers in Japan discovered that beetles with longer mandible weapons have smaller testicles and less ejaculate than their brethren. In a paper published yesterday in the Proceedings of the Royal Society B, charmingly titled…