Whether it's out-of-bounds behavior or savage instincts, when animals act out, they're forces to be reckoned with.

From sudden shocks and blindsiding attacks to jaw-dropping body slams and bone-rattling collisions, the animal kingdom is full of astonishing ambushes.

Sneaky creatures commit crazy acts, from macho street brawls to out-of-control collisions and animal escapes.

A circus lion resists captivity; open water swimmers get a surprise visit from a pair of whales; a dog is left on the wrong side of a door.

A great white comes between another shark and its meal; a capuchin monkey touches a power line; a python sinks its teeth into a crocodile.

A group of fishermen meet a giant anaconda; beach goers witness a massive gathering of sharks; a researcher gets on the wrong side of a moose.

A pod of orcas and a tiger shark engage in a clash of apex predators; a serenade goes awry when a bat takes a bite out of the guitarist.

The most treacherous animal mistakes; fearsome surprise attacks; bone-crushing collisions; predators in too deep and animals pushed too far.

A pair of giraffes battle viciously for dominance; a fisherman is caught by feeding alligators; a buffalo tosses a lion like a rag doll.

An elephant has a run-in with a carload of tourists; a lion's instincts won't be tamed; a tiny dog takes on armed robbers.

Strange animal run-ins when a primate interrupts a traffic stop and a serpent joins a massage session.

From the deepest seas to the tallest mountains, animals prove that when it comes to Mother Nature, there's always an exception to the rule.

Beloved pets reveal their true selves in viral videos.

The fiercest life and death struggles in nature.

Life or death encounters between man and beast.

Wild animals doing unexpected or unbelievable antics.

Humans and animals find themselves in danger and need to escape.

People leave the beaten path and head into the wilderness looking for adventure only to come face to face with nature's wild side.

Fearless humans save wild animals in trouble.

A French bulldog chases off three black bears in one risky standoff; a kitten finds itself in the middle of heavy traffic; a sea lion with major stamina shows that being out of water won't necessarily save it.

A whale gets frighteningly close to some kayakers; a day at the pool for a family of bears.

Put up your dukes -- er, paws -- and prepare to discover epic, bone-shattering clashes between some of the world's deadliest predators. From lions, tigers and bears to meerkats, mongoose and mice, the series features testosterone-induced battles between some of the biggest, baddest and often surprising fighters in the animal kingdom, revealing the extraordinary motivations and strategies that fuel each incredible brawl.

In the varied forms of veterinary medicine, Dr. Susan Kelleher's practice may be one of the more unusual. Known as Dr. K, she runs South Florida's Broward Avian and Exotics Animal Hospital, and this series follows the staff as it cares for rabbits, ferrets, foxes, fish, birds, reptiles, marsupials, and even primates. As do some other vets, Kelleher thinks domesticating wild animals like monkeys is a bad idea, but that feeling doesn't interfere with her taking care of them: "If it will fit through the door, I'll treat it," she says.

Only the strongest survive in the animal kingdom, where the competition for food, territory or mates means employing skillfully crafted tricks of the trade. "Animal Armory" incorporates high-end imagery and computer graphics to reveal how wildlife use their teeth, claws, antlers, camouflage, venom and even spit to threaten and intimidate rivals and predators alike. With weapons of deception, animals disarm and entice prey to their death. Meanwhile, perhaps the oldest weapons employed by animals are projectiles, which have evolved into their own versions of poison-tipped harpoons, chemical missiles and high-powered bullets.

Produced by the team that created BBC's "Planet Earth" series, "The Hunt" explores the relationship between predators and their prey. Sir David Attenborough narrates this documentary while the cameras follow the animals in their natural habitats. With a specific focus on strategy, the hunters are examined in detail -- from their use of the environment to their sharp instincts and physical prowess. On the other side of the fence are the hunted, which use their senses and defense tactics to flee when they feel threatened. Each episode centers on a different habitat, and the last one focuses on the state of the planet.