Leopard seals, top predators of Antarctic oceans, are observed by underwater photographer Goran Ehlme as they prey on hapless penguins. Included: a close encounter with a large, aggressive female leopard seal.
The heavyweight champ of the Luangwa River in Africa is determined in a 10-round comparison between hippos and crocodiles that factors in size, defensive capabilities and metabolic efficiency.
Night-vision cinematography and infrared cameras observe the activity of nocturnal felines, including servals and wildcats and a caracal caring for its litter of kittens.
Researcher Holly Carroll studies a troop of yellow baboons in Tanzania, focusing on the matriarchal structure of the group and threats from human encroachment and habitat destruction.