Grizzly Cat

Cat versus bear cub: sentimental romp, or nature red in tooth and claw? Watching the two tangle playfully in a Russian hunting camp, the line is hard to draw. Video after the jump.

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The Nature of Petroglyphs

The Bradshaw paintings, petroglyphs found on the lands of Australia's Wanjina Wunggurr Wilinggi people, are perhaps 46 to 70,000 years oldyet their colors remain bright, their figures sharply delineated. A new study suggests that the colors remain vivid because they're alive.

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Flocks of Trouble

A mystery deepens as more redwing blackbirds turn up dead in the America South. It's likely not UFOs or secret weapons, but the birds' instinctual flocking behavior, that's to blame.

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