The waters of Australia are home to a variety of intriguing octopus and cuttlefish species. One is armed with a special weapon. It's an octopus measuring only 8 cm in length called the blue-ringed octopus. With venom powerful enough to kill humans, this octopus bites and kills prey several times its size. The blue rings on the body are a sign of its deadly poison and are effective to keep away even the most deadly of fish. For years, this octopus was considered invincible, but experts recently discovered it actually has a natural enemy. This episode takes an up-close and personal look at this little octopus cleverly surviving in the hostile sea environment.

The waters of Australia are home to a variety of intriguing octopus and cuttlefish species. One is armed with a special weapon. It's an octopus measuring only 8 cm in length called the blue-ringed octopus. With venom powerful enough to kill humans, this octopus bites and kills prey several times its size. The blue rings on the body are a sign of its deadly poison and are effective to keep away even the most deadly of fish. For years, this octopus was considered invincible, but experts recently discovered it actually has a natural enemy. This episode takes an up-close and personal look at this little octopus cleverly surviving in the hostile sea environment.

During summer, the Atlantic coast of the northeastern United States attracts huge amounts of fish and wildlife. Particularly interesting are the basking sharks, the world’s second-largest fish, and the leatherback sea turtles, which weigh one ton and are the world’s largest reptile.

During summer, the Atlantic coast of the northeastern United States attracts huge amounts of fish and wildlife. Particularly interesting are the basking sharks, the world’s second-largest fish, and the leatherback sea turtles, which weigh one ton and are the world’s largest reptile.

This story takes place in the vast northern land near the coast of the Sea of Okhotsk in eastern Hokkaido. Taking center stage are two mother Hokkaido red foxes caring for 10 pups. The mothers, who are in fact mother and daughter, each use their strengths and display amazing parental teamwork.

This story takes place in the vast northern land near the coast of the Sea of Okhotsk in eastern Hokkaido. Taking center stage are two mother Hokkaido red foxes caring for 10 pups. The mothers, who are in fact mother and daughter, each use their strengths and display amazing parental teamwork.

The Comb-crested Jacanas are unique birds that use their long toes to walk delicately across lotus leaves and catch underwater prey. This episode, filmed between the rainy season and dry season in Kakadu, follows a father bird raising his chicks through their dramatic and difficult first year.

The Comb-crested Jacanas are unique birds that use their long toes to walk delicately across lotus leaves and catch underwater prey. This episode, filmed between the rainy season and dry season in Kakadu, follows a father bird raising his chicks through their dramatic and difficult first year.

So, you think you know penguins? Experience life in "Penguin Paradise", on South Island, New Zealand, from which the first penguins are supposed to have evolved. Home to unusual penguins like the Little Penguin, and the forest-dwelling crested Fiordland Penguin - it is a penguin wonderland!

So, you think you know penguins? Experience life in "Penguin Paradise", on South Island, New Zealand, from which the first penguins are supposed to have evolved. Home to unusual penguins like the Little Penguin, and the forest-dwelling crested Fiordland Penguin - it is a penguin wonderland!

Arguably in the top three on everyone's list of "cutest animals", the koala lives a sleep-filled life. This film follows the koala community of Otway Forest, south of Melbourne, Australia. How do koalas behave? -- and when are they awake?

Arguably in the top three on everyone's list of "cutest animals", the koala lives a sleep-filled life. This film follows the koala community of Otway Forest, south of Melbourne, Australia. How do koalas behave? -- and when are they awake?

Following a large family of gorillas over nine years, this film captures many aspects of unique behavior as well as revealing touching stories of compassion among this gorilla family in the tropical rainforests of Gabon.

Following a large family of gorillas over nine years, this film captures many aspects of unique behavior as well as revealing touching stories of compassion among this gorilla family in the tropical rainforests of Gabon.