When you have to go, you have to go -- and sharks are no different. During a dive in Guadalupe, Mexico last year, a lucky(?) diver caught a glimpse of famed great white Lucy leaving behind a sizable cloud of murk in the water behind her:
Interestingly, shark poop can be a legitimate source of nourishment for animals down the food chain. In a 2011 interview with LiveScience, Georgia Aquarium scientist Alistair Dove explained that shark poop contains "enough useful carbon for smaller animals to make a meal of it."
Fossilized shark dung has also given scientists an unprecedented window into the past. Preserved poop, scientifically known as coprolite, often contains hints toward what ancient sharks ate before their death; recent coprolite finds tell the tale of a hungry shark that munched on a baby turtle and an overzealous shark that attempted to eat a crocodile.