Watch: See how a drug kingpin's pets are becoming a nuisance, and what scientists are doing about it.

It is perhaps fitting that invasive hippos, with their "hungry, hungry" reputations, would be the lasting legacy of one of the world's most notorious drug lords. Colombia's Pablo Escobar built an empire on cocaine that made him one of the richest, and most feared, people in the world.

His organization was responsible for an estimated 7,000 deaths and nearly toppled the democratic government of Colombia through assassinations, bribes, and intimidation. But in addition to the violence and drugs, Escobar was a self-styled Robin Hood, sponsoring soccer teams and giving handouts to poor communities.

One of those "benefits" was the invitation for locals to visit his private zoo, which Escobar built in the early 1980s on his leafy ranch Hacienda Napoles, about halfway

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