One of the most notorious criminals of all time, Pablo Escobar left behind a legacy that doesn't get as much attention as the drugs, crime and death he spread around the world. But, it's one that Colombia is now having to come to terms with, years after his death. Hippopotamuses, originally illegally imported for Escobar's private zoo, are now breeding and spreading throughout Colombia's biggest river system. Locals love them... for now. But hippos are huge, dangerous, and... they poop an awful lot. Learn why this is a problem as well as something you never wanted to know about their genitals on this episode of The Cliff's Edge.