S1, E1: The infamous drug lord Pablo Escobar was notorious for smuggling cocaine, but perhaps less known for illegally importing exotic species to his personal zoo. Soon after Escobar's demise, the animals were left alone, and now, one of these species has invaded the Colombian countryside ' a herd of more than 30 giant hippos! Join Nat Geo WILD for an exclusive look at the so-called "cocaine hippos" and the battle to control this thriving African invader.