1. Cocaine Hippos

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. 14 July 2011. 44 min

The infamous drug lord Pablo Escobar was notorious for smuggling cocaine, but perhaps less known for illegally importing exotic species to his personal zoo.

2. Pigzilla

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. 21 July 2011. 44 min

As many as 23 million feral pigs have taken over Australia, causing an untold amount of damage.

3. Giant Swamp Rats

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. 28 July 2011. 44 min

Giant swamp rats are taking over the U.S. and destroying fragile ecosystems from Maryland to Oregon.

4. Moose Rampage

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. 4 August 2011. 44 min

A moose in the country is no big deal, but a moose in a New York suburb is a recipe for disaster.

5. Coyote Army

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. 11 August 2011. 44 min

Coyotes are invading backyards across America. With sharp teeth, wily intelligence and a body built for speed, these formidable predators can adapt and survive in nearly any environment.

6. Bed Bug Doomsday

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. 18 August 2011. 44 min

More and more people are falling victim to one of mans oldest parasitic pests, one that lives in colonies hidden in our furniture and literally drinks our blood while we sleep: bed bugs.