A triathlete is attacked by a bull shark while training in Alabama. After being bit by a rattlesnake, a father fights to survive. A couple is attacked by a giraffe on vacation in Zambia. And a girls' trip turns deadly in Cancun.

On Christmas Eve, Matt Chenhall is walking with his two daughters when he is attacked by an enormous kangaroo. Lauren Fagen is volunteering at an animal sanctuary in South Africa when a lion reaches under a gate and pulls her legs through the bars.

Twenty miles into a marathon in a remote part of New Mexico, Karen Williams finds herself caught between a bear and her cub; Steve Campbell is working on an oil pipeline in Alberta, Canada, when a mountain lion attacks him.

Colorado park ranger Andy Peterson is hiking when he crosses paths with a mountain lion and its prey. And in Vancouver, Kari Toft is walking her dog just steps from her home when she is attacked by a vicious raccoon.

Professional climber Greg Boswell is high up an ice-covered Canadian mountain in the middle of the night when he is charged by a grizzly bear. And in upstate New York, a retired nurse is attacked by a rabid coyote.

Catherine Dwinnell is hiking in Alaska when she is struck from behind and attacked by a 1,000 pound moose. In Hawaii, Tony Lee is swimming a half mile from shore when something grabs him and drags him below the surface.

Allena Hansen is working on her ranch in the California desert with her two rescue dogs when she is attacked by a black bear. And in Cancun, Mexico, Jonathan Schoeneman is spearfishing with his best friend when he comes face to face with a crocodile.

Greg Matthews and his brothers are on a dream trip in Alaska when they cross paths with a grizzly bear. In Australia, Ella Murphy and her friends are surfing when she is violently struck in the face by a mystery assailant.

Nicole Moore's vacation in Cancun, Mexico is cut short when she is attacked by a shark close to shore. In Tennessee, firefighter Kyle Watson and his family are hiking in the woods when he is bitten by a timber rattlesnake.

Wayne Petteway is attacked by an alligator while checking crab pots in North Carolina. In Arizona, Peter Baca is camping with his girlfriend and one-year-old son when he is awoken by something attacking him through the walls of the tent.

Paul Templer is leading a canoe safari on the Zambezi River near Victoria Falls when a hippopotamus bursts to the surface and drags him into the water; in Texas, an animal pounces on 5-year-old Jade DeMoss.

Micki Glenn is attacked by a shark during a dive trip. Hours from the nearest medical facility, she has to rely on her husband and friends to save her life. And, a couple celebrating their wedding anniversary are attacked by a giraffe while on safari.

Hiking in the Montana mountains, trail engineer Todd Orr is attacked twice by grizzly bear protecting her cubs. And, during a vacation in the Bahamas, Tiffany Johnson is snorkeling when she finds herself face to face with a tiger shark