The Tuberous bushcricket’s testicles account for 14 percent of its body weight. To put that in perspective, the testicles of a 200-pound man with that ball-to-body ratio would weigh 28 pounds…

“Traditionally it has been pretty safe to assume that when females are promiscuous, males use monstrously-sized testicles to deliver huge numbers of sperm to swamp the competition – even in primates,” study researcher James Gilbert of the University of Cambridge said in a statement.