An aggressive encounter between two male greater prairie chickens (Tympanuchus cupido). During aggressive encounters, males leap into the air and strike their opponent with feet, wings and/or beak. Fort Pierre National Grassland, South Dakota. Gerrit Vyn/gerritvynphoto.com hide caption

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Grunts And Gurgles Signal Love For Grouse

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In Europe, A Cow Over Hormone-Treated U.S. Beef

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A stunning golden tapestry woven from spider silk is unveiled at the American Museum of Natural History in New York City after four years of work — and the help of more than 1 million spiders. R. Mickens/AMNH hide caption

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Spider Wranglers Weave One-Of-A-Kind Tapestry

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Saving Turtles From The Wrong Side Of The Tracks

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Paleontologists Unveil New Fossil Finds

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T. Rex Fossil Up For Auction

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Even T. Rex Started Small

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Fossil Overturns Thinking On Tyrannosaurus

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Thanks To Gene Therapy, Monkeys See In Full Color

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A smallmouth bass caught on a lake near Ely, Minn. One-third of smallmouths surveyed by the USGS showed signs of intersex. Sam Cook hide caption

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Study: Gender-Bending Fish Widespread In U.S.

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A glacier in Patagonia, Argentina, calves, with a sudden collapse of ice. Researchers say that the activity that precedes these types of tipping points and the triggers that cause them may follow predictable patterns. Philip Stanley Dickson/iStockphoto.com hide caption

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Predicting The Crash: Tracking Tipping Points

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Julie Feinstein, collection manager of frozen tissue lab at AMNH, removes a rack of samples from one of the liquid nitrogen-cooled storage vats. She's wearing special gloves so that, as she puts it, she doesn't stay attached to the vat. R. Mickens/AMNH hide caption

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DNA 'Barcode' To Help Nab Illegal Wildlife Traders

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Jane Goodall Sees 'Hope For Animals'

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Beware The Attack Bird: Vineyards Turn To Falcons

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Monkeying With Music's Impact On Apes

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