Here’s Why Sharks Have Two Penises
Cartilaginous fishes, like sharks and rays, are blessed with something called “claspers,” dual sperm-releasing tubes jutting from their pelvic fins. Why two? Thanks to a recent study published in the journal Nature Communications, we now know more about the sea creatures’ mysterious double dongs. Many animals, including humans, have a gene called Sonic hedgehog (Shh)—named…
