Pablo Escobar's hippos have changed region's water quality: Study

Hippopotamuses brought by Colombian drug lord Pablo Escobar for his family's zoo in Colombia's Puerto Triunfo municipality are changing the area's water quality by importing large amounts of organic material from their surroundings, a study has found. The zoo's other animals had been safely relocated, except for the hippopotamuses, whose population has since risen from four to over 80.