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Hatcheries fail to deliver on their promise of a future full of salmon.

The incredible lifecycle of one of the world's most popular and important fish.

Facts and stats about the members of the Salmonidae family.

After spending most of their life in the ocean, Pacific salmon return to the fresh-water rivers of their youth in order to spawn.

A fight erupts between two koalas after one of the males invades the other's territory. Watch a scene from Cracking the Koala Code which premieres May 16, 2012 at 8/7c (check local listings).

A male koala roams the Australian suburbs in search of a mate to produce offspring. Watch a scene from Cracking the Koala Code which premieres May 16, 2012 at 8/7c (check local listings).

A baby koala consumes his mother's pap, a secretion that will give the joey the bacteria needed to digest eucalyptus leaves. Watch a scene from Cracking the Koala Code which premieres May 16, 2012 at 8/7c.

Watch a preview of the upcoming PBS Nature film that examines the significance of koala communication and follows the scientists who are studying the animal's every move and vocalization.

Kruger National Park is one of the largest game reserves in Africa, located in north-east South Africa, and spanning 7,523 square miles (19,485 square kilometers).