Some insects and sea creatures produce sperm that is up to 10 times bigger than they are. Now scientists have used an innovative new x-ray technology to show how this bizarre situation evolved over hundreds of millions of years.

It sounds like a genetic aberration, but supergiant sperm can actually be an evolutionary advantage in several species. Fruit flies are a just a few millimeters long, but their sperm are 6 cm long. To top that, a human male would have to shoot out sperm that are up to 60 meters long. Another super giant sperm producer is a type of ostracod, a sea crustacean that looks like a tiny snail less than a centimeter long. Its sperm grows up to 10 times longer than its body. Here you can see an X-ray holotomograph of some super giant sperm.

See other pictures: here