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3:10
An African lioness that looks and acts male may be the secret to her pride's success.
1:04
In the Arctic dawn, the true majesty of the snowy owl can be seen in its frozen kingdom.
1:12
Footage of the first wild Siberian tiger that filmmaker Sooyong Park captured on camera.
1:00
A male koala wanders into the Australian suburbs in search of a mate to produce offspring.
1:11
A fight erupts between two koalas after one of the males invades the other's territory.
6:05
This segment examines a battle between two male koalas for territorial dominance.
1:12
Two lionesses attack an unfamiliar and aggressive male who approaches the pride.
3:04
Fortress of the Bears filmmakers recap on the time they spent shooting in Alaska.
1:03
It's taken all spring and summer, but salmon finally return to Admiralty Island to spawn.
