Out For Lunch? Researchers estimate that billions of birds and small mammals are killed by cats in the U.S. annually. Vishnevskiy Vasiliy/iStockphoto hide caption

itoggle caption Vishnevskiy Vasiliy/iStockphoto

Cows graze in front of the Rosengarten mountain massif in northern Italy. Pasture grazing is practiced throughout the Alps. Matthias Schrader/Associated Press hide caption

itoggle caption Matthias Schrader/Associated Press

Two camels fight during the Camel Wrestling Championship in the town of Selcuk, near the western coastal city of Ismir, Turkey, on Jan. 15, 2012. It's the biggest event of the camel-wrestling season in Turkey. Tolga Bozoglu/EPA /Landov hide caption

itoggle caption Tolga Bozoglu/EPA /Landov

The streets of Paris are marred by messes from dogs whose owners haven't cleaned up after them. There's a fine, but the culprits have to be caught in the act (or lack thereof). Eleanor Beardsley/NPR hide caption

itoggle caption Eleanor Beardsley/NPR

Trawlers in the Gulf of Maine are allowed to catch Maine shrimp during a limited season that started this week. Gulf of Maine Research Institute hide caption

itoggle caption Gulf of Maine Research Institute

Got spaghetti? Dogs digest starch more efficiently than their wolf ancestors, which may have been an important step during dog domestication. Lauren Solomon/iStockphoto.com/Nicholas Moore /Courtesy of Nature hide caption

itoggle caption Lauren Solomon/iStockphoto.com/Nicholas Moore /Courtesy of Nature

Two chimps groom each other at the Save the Chimps facility in Florida. The National Institutes of Health owns about 360 chimpanzees that aren't yet retired and that are living at research facilities; new guidelines say most of its chimps should be retired. Save the Chimps hide caption

itoggle caption Save the Chimps

A group of volunteers is helping biologists see whether there are any martens left in the Olympic National Forest in Washington state. U.S. Fish and Wildlife Service hide caption

itoggle caption U.S. Fish and Wildlife Service

Boiling is the easiest way to dispatch a crustacean, but there are some signs that the creatures can feel pain. iStockphoto.com hide caption

itoggle caption iStockphoto.com