This may have happened a few years ago, but Sooty's exploits still manage to impress.
This lecherous little dude from South Wales escaped from his pen one night, sneaked into the female guinea pigs' quarters, and managed to seduce and couple with 24 females. That night, farmhands looked in the ladies' quarters and found him in a corner, spent and sleeping off his frenzied night of guinea pig love. "He was absolutely shattered," said one keeper, "--we put him back in his cage and he slept for two days." 10 weeks later, 42 guinea pigs were born--as was the Legend of Sooty. (Thanks for this, mgod!)