A countdown of the top 10 unbelievable mindbenders.

Explosive river invaders, trespassing reptile behemoths, and tyrants fighting to end all competition; these clashers and crashers battle to the death; when an animal strays from home, anything can happen; a countdown of the top ten deadly duels.

A countdown of the top 10 mind-bending moments, including saviors turned savage, camouflaged ambush killers and creatures too bizarre to be true.

Friendly animals on the attack; deadliest annual migration in the world; an unrelenting avian rain straight from a horror movie.

Gentle giants riled; real-life zombie slaves; biblical swarms out of a horror film.

Hunters become the hunted; killers seek revenge in fierce battles to the death.

A hostile takeover; invading forces take over an island; deadly jacket.

Aggressive aquatic predators, a journey into a deadly snake pit, and a bicycle crash; a countdown of the 10 craziest collisions.

Battles of David vs. Goliath; animals overcoming impossible odds; gangs of predators ambush their prey.

Sudden deadly collisions; strange otherworldly beings; terrifying insect invasions.

CGI animation helps illuminate stories from around the world that recount how someone's life has been changed forever by an unexpected encounter with an animal, sometimes heartwarming, sometimes utterly terrifying.

Comedian Rachel Reenstra takes viewers around the world to encounter a variety of animals and discuss their behaviors with experts. But why a comedian who admittedly knows little about animals? Because she says she always makes a point of observing human behavior (helps with the jokes), and here the aim is to gain even more knowledge about how people interact with one another by examining how it's done in the animal world.

Australian host Steve Irwin and his wife Terri run a wildlife refuge. Their shared passion is educating the world about wildlife, including the much feared crocodile and numerous venomous snakes. Steve's speciality is the capture and relocation of crocodiles. No animal appears too threatening to Steve, his true respect for animals is the foundation for everything he does.

Biologist Jeff Corwin explores the world, exposing and explaining aspects of the diverse animal kingdom. In an educational show that's also made to entertain, Corwin shares his experiences with viewers on fascinating trips into the wild, which is as close as people can get without actually being there themselves.

Jeremy Wade is not a fisherman; he's an "extreme angler" in search of the biggest and most dangerous freshwater fish, the kind with a taste for human flesh. This action-adventure series also features Wade illustrating how these river monsters are constructed to kill.

Dr. Brady Barr, a herpetologist by trade, travels all over the world to study reptiles and other creatures in their native habitats, often risking his life in the process. His mission is two-fold: to collect as much information as possible about the animals he studies and to inform the public about the state of the planet and the risk of extinction many animal species face. And, of course, there's another benefit to all his work: It makes great TV.

Man's encounters with mysterious and often deadly creatures are legendary, all the more reason to build a series around them using first-person accounts told through re-enactments.

Field officers of the Michigan Humane Society respond to calls reporting animals in distress. The investigators at the nonprofit agency handle more than 4,000 cases annually, with the crimes relating to everything from dog-fighting, pets exposed to the elements and animal neglect. The program also includes updates on previous perpetrators and their animal victims.