"Ride 'em, cowboy!"

That's a bottlenose dolphin trying to shake loose an octopus that has latched on to the dolphin's genital slit.

The dolphin made two leaps before it shook off the cephalopod. "Whales have been reported on numerous occasions to breach," says Gonzalvo, "as a strategy to remove parasites and barnacles."

Found at New Scientist.