The Invaders

Once the prized pets of Pablo Escobar, hippos have flourished long after their importer's demise. The dangerous and potentially aggressive invaders are claiming territory in Colombia's rivers.

Australia is being overrun by an invasive feral pigs that have already caused untold damage, and further destruction is inevitable if they're not stopped.

In wetlands around the United States, an invader called the nutria is taking over, multiplying at an unbelievable rate and driving out native wildlife.

Follow renowned moose experts as they examine the problems moose can bring to communities - including attacks on humans - and explore how man and moose can live together peacefully.

Coyotes have colonized many of the urban habitats of North America. Join experts as they try to determine the best ways to stay safe when living amongst these clever canines.

Major cities in the United States are in the grip of an invisible invasion. More and more people are falling victim to one of man's oldest parasitic pests, one that lives in colonies hidden in our furniture and literally drinks our blood while we sleep: bed bugs.