A new study looked at the male sexual organ of barnacles, which it turns out is a marine creature that has been studied dating all the way back to Charles Darwin. When it comes to long distance ...

In absolute terms, the blue whale has the largest penis of any animal—a huge mobile appendage that can reach 10 feet in length. But the blue whale itself is enormous. If you take body size into ...

A barnacle, observed the nineteenth-century zoologist Louis Agassiz, is "nothing more than a little shrimp-like animal standing on its head in a limestone house and kicking food into its mouth." Yet ...