A bed of eel grass (Zostera marina) flutters in the current along the California coast. David Wrobel/Visuals Unlimite/Corbis hide caption

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Underwater Meadows Might Serve As Antacid For Acid Seas

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Our popular image of Homo erectus as the proto-guy who whose human-like traits all emerged at once needs overhauling, some anthropologists say. Sylvain Entressangle/Science Source hide caption

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Dance Of Human Evolution Was Herky-Jerky, Fossils Suggest

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Being a bit coldblooded has its charms, scientists say. A mammal the size of a T. rex, for example, would have to eat constantly to feed its supercharged metabolism — and would probably starve. Publiphoto/Science Source hide caption

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Maybe Dinosaurs Were A Coldblooded, Warmblooded Mix

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Hairlike sensors on the the legs of the golden silk spider help it "listen" to the thrum of its web. I'll Never Grow Up/Flickr hide caption

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Spiders Tune In To Web's Music To Size Up Meals And Mates

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Scientists Find Africa's Longest Land Migration: Zebras' 350-Mile Trek

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Clint Muhlfeld, an aquatic ecologist with the USGS, holds a native Westslope cutthroat trout in Glacier National Park. Noah Clayton/USGS hide caption

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Hybrid Trout Threaten Montana's Native Cutthroats

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Scientists Discover Carbon Cycle Is Out Of Whack

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Kalron and his team have set up video cameras that transmit real-time images of the bai via satellite. Courtesy of Maisha Consulting hide caption

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Former Commando Turns Conservationist To Save Elephants Of Dzanga Bai

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A female forest elephant charges, in Dzanga-Sangha Special Reserve in the Central African Republic. Michael K. Nichols/National Geographic/Getty Images hide caption

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Civil War Invades An Elephant Sanctuary: One Researcher's Escape

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Pat Leiggi (right) of the Museum of the Rockies prepares to move a leg bone of the T. rex at the Smithsonian's Natural History Museum in Washington, D.C., on Tuesday. Maggie Starbard/NPR hide caption

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A T. Rex Treks To Washington For A Shot At Fame

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Methane-Producing Microbes Caused 'The Great Dying'

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Courtesy of Bob Walters

The 500-Pound 'Chicken From Hell' Likely Ate Whatever It Wanted

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Magellanic penguins strut their stuff on the rocky shoreline of Argentina's Punta Tombo, home to the largest colony of the birds in the world. Craig Lovell/Corbis hide caption

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Changing Climate In Argentina Is Killing Penguin Chicks

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A close-up schematic of leaks near the U.S. Capitol shows high leak densities east of the building, but few leaks over the National Mall, where very few natural gas pipelines exist. Robert B. Jackson/Environmental Science and Technology hide caption

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About 6,000 Natural Gas Leaks Found In D.C.'s Aging Pipes

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Ask not for whom the wolf stalks ... Holly Kuchera/iStockphoto hide caption

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When Big Carnivores Go Down, Even Vegetarians Take The Hit

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