6. Killer Pig (2009)

At four feet wide and 1,000 pounds, the killer pig was a prehistoric battle tank that dominated the North American landscape. Endowed with some truly unique bioengineering traits, the killer pig relied on its massive three-foot-long skull and binocular vision to catch its prey. Learn how the killer pig was an evolutionary success, despite its eventual extinction.

Release date: 2009-10-12