NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

Animals ranging from giant humpback whales to tiny eels make massive journeys in search of food and mates.

Birds may have a reputation for being less than geniuses, but researchers are discovering that some are remarkably smart.