Tagging a whale shark isn't easy. The giant fish's skin is thicker and tougher than any animal in the world, and when this diver moves in, the shark adopts a defensive posture.

Thought lions didn't like to get their feet wet? Think again! These big cats are just as dangerous on water as they are on land. (From "Swimming Lions," Season 2)

Christmas Island red crabs launch their eggs at the ocean's edge, which hatch into swimming crab larvae. These larvae may be why whale sharks are visiting Christmas Island.

Meet amazing creatures that thrive in one of the most inhospitable places on earth: Africa's Namib Desert. (From "Survival of the Sand Creatures," Season 1)

Na'abi the hyena princess allows a pack of cheetahs to serve up dinner, then moves in for the rewards. (From "Hyena Princess," Season 6)

A king cobra takes on a king-sized meal. (From "King Cobra and I," Season 4)

What you're about to see has never been caught on camera... until now. Under cover of darkness, a caracal stalks her prey: a white stork. Her kittens' lives depend on her success. (From "Night Cats on the Prowl," Season 2)

A pair of lions invite themselves to a feast, which doesn't go over well with the hungry hosts. Will they survive the encounter? (From "Predators in Peril," Season 6)

Can dogs keep cheetahs from attacking livestock? (From "Cheetah: Race Against Time," Season 3)

Within the Central African Republic's Dzang-Sangha National Park, the secret lives of the forest elephants will finally be exposed.

Everyone knows the playful side of penguins, but do penguins ever show signs of aggression? (From "Return to Penguin City," Season 6)

An overwhelmed devil mom gets a little human help. (From "Devil Diary," Season 3)

The mighty male and the lonely female, these two leopards work hard to survive in a kingdom where the mighty lion is in charge. (From "Stalking Leopards," Season 5)

A head like a tail? The body of the red-faced ukari monkey defies logic. Find out the why some say this monkey's tail looks like its head, and vice versa. (From "Red-Faced Uakari Monkey," Season 7)

It's cheetah vs. gazelle when a hungry cheetah breaks the norm and attacks a musclebound Grant's gazelle. Is this the kiss of death for the gazelle, or the cheetah? (From "Cheetahs: Against All Odds," Season 7)

A zoologist develops a connection with a wild wolf when a chance encounter turns into a three-hour howling session. (From "Global Wolf," Season 4)

An overwhelmed devil mom gets a little human help. (From "Devil Diary," Season 3)

A king cobra takes on a king-sized meal. (From "King Cobra and I," Season 4)

Meena Wenkat observes as an Asiatic lioness stalks her prey to feed her cubs. (From "Last Lions of India," Season 5)

Christmas Island red crabs launch their eggs at the ocean's edge, which hatch into swimming crab larvae. These larvae may be why whale sharks are visiting Christmas Island.

A head like a tail? The body of the red-faced ukari monkey defies logic. Find out the why some say this monkey's tail looks like its head, and vice versa. (From "Red-Faced Uakari Monkey," Season 7)

Romulus Whitaker rescues a reluctant king cobra. (From "King Cobra and I," Season 4)

Everyone knows the playful side of penguins, but do penguins ever show signs of aggression? (From "Return to Penguin City," Season 6)

Young elephant seals enter the water for the first time, and there are several challenges. Some don't make it very far, since there are orcas lurking in the waters. (From "A Man Among Orcas," Season 4)

What you're about to see has never been caught on camera... until now. Under cover of darkness, a caracal stalks her prey: a white stork. Her kittens' lives depend on her success. (From "Night Cats on the Prowl," Season 2)

Meet amazing creatures that thrive in one of the most inhospitable places on earth: Africa's Namib Desert. (From "Survival of the Sand Creatures," Season 1)

Biologist Bryan Fry goes diving to collect deadly sea snakes. He will milk them for their venom, which will be used in medicines for those who are bitten. (From "Sea of Snakes," Season 4)

It's cheetah vs. gazelle when a hungry cheetah breaks the norm and attacks a musclebound Grant's gazelle. Is this the kiss of death for the gazelle, or the cheetah? (From "Cheetahs: Against All Odds," Season 7)

Free in the park, Sweety enjoys her many travels, but danger could be lurking just around the corner for this red panda. (From "Return of the Fire Cat," Season 4)

Thought lions didn't like to get their feet wet? Think again! These big cats are just as dangerous on water as they are on land. (From "Swimming Lions," Season 2)

A pair of lions invite themselves to a feast, which doesn't go over well with the hungry hosts. Will they survive the encounter? (From "Predators in Peril," Season 6)

A zoologist develops a connection with a wild wolf when a chance encounter turns into a three-hour howling session. (From "Global Wolf," Season 4)