The deep-water-research submarine Alvin is launched from Atlantis. Scientists are studying how ecosystems in the Gulf of Mexico may have been affected by the Deepwater Horizon oil spill. Richard Harris/NPR hide caption

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Deep-Water Dive Reveals Spilled Oil On Gulf Floor

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Scientists, Nations Disagree Over Tuna Catch Limits

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Finding 'Teachable Moments' In Animal Tales

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Four of the seven lion cubs (Panthera leo) recently born at the National Zoo in Washington, D.C. Lions boast a special form of sister and brotherly alliance: sisters stay together all their lives in prides, and brothers form coalitions to conquer other prides. Mehgan Murphy/Smithsonian Institution hide caption

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Brotherly (And Sisterly) Love In The Animal World

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LANGKAWI, MALAYSIA: A snake "jumps" off of a tree branch in Langkawi, Malaysia.    Selah Reeve Hobbie Jr. /National Geographic Channels hide caption

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Sakes Alive! Snakes That Fly!

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Summit Aims To Protect Tigers From Extinction

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Tuning In To The Brain's 'Cocktail Party Effect'

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It's important to talk to your vet about any changes in your dog's behavior or diet, says veterinarian Nicholas Dodman. iStockphoto.com hide caption

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Helping Your 'Good Old Dog' Navigate Aging

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Scientists say the pterosaur, shown here on display at the National Museum of Emerging Science and Innovation in Tokyo, may have been able to fly as high as 15,000 feet for distances up to 12,000 miles at a time. Itsuo Inouye/AP hide caption

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Peerless Pterosaur Could Fly Long-Distance For Days

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Target (right) and Rufus became heroes when they kept a suicide bomber from taking lives in Afghanistan. A third dog, Sasha, was killed in that attack. Johnny Crawford/Atlanta Journal & Constitution/AP hide caption

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A Tragedy That Shouldn't Happen To A Hero Dog

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Wild turkeys cross a street in La Conner, Wash., where the birds have called home since 2004. La Conner's town council recently voted to remove the flock due to sanitation concerns. Marilyn Dunstan/Getty Images hide caption

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Charm Gone, Town Kicks Out Free-Ranging Turkeys

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Lillian Stokes

New Guide Helps Birders Play The Match Game

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Kirk Johnson, chief curator at the Denver Museum of Nature & Science, inspects the Ice Age bison skull. Heather Rousseau/Denver Museum of Nature & Science hide caption

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Mammoth Find Gives Glimpse Of Rockies In Ice Age

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In New York, Pigeon Keepers Flock Together

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