“While the human penis functions primarily to transfer sperm, our result suggests its unusual large size evolved as a sexual ...

Quick, imagine an animal tongue. What came into your mind? The flicking forked tongue of a snake? A cow licking a block of ...

Ducks evolved reverse spirals and sperm storage that give females surprising control, challenging long-held assumptions about ...

Scientists discovered fossilized reptile skin in an Oklahoma cave, revealing the oldest known example dating back nearly 300 million years.