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Pablo Escobar, one of the richest and most violent drug lords in history, illegally imported four hippos into Colombia for his private zoo in the 1980's. Thirty years later, the hippos have multiplied to 32, creating a massive problem for the country.

South Florida is under siege from a new invasive species. This time, they're man-eaters, African Rock Pythons. These lethal giant constrictors are one of nature's most aggressive snakes.

From the woman who thinks of her cats as her babies to the shut-in trying to save the world one cat at a time, dating coach Alyson Mischel brings her expertise to cat ladies of all types to help them get off the couch and into the world of dating.

Bed bugs have descended upon the United States, creating a pandemic. These critters can infiltrate our businesses, movie theaters and homes. Entomologists, pest control companies, and victims detail the creepiest and most obscene bed bug stories ever.

Exotic species released on foreign soil become invasive species. Without natural predators, growing populations wreak havoc and in the U.S., the gateway is Florida where giant rats, lizards, feral hogs and lethal pythons are on the most wanted list.

The story behind internet phenomenon, "Christian the Lion" and the five-minute video that told the story of the emotional reunion between two young men and their 300 pound pet lion a year after he was released into the African wild.