Flies are attracted to glycerol, a chemical in beer produced during fermentation. Understanding more about the genes responsible for taste and smell in flies could help make powerful insect repellents. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Isabella Colbdorf feeds salad to a turkey at this year's Feeding of the Turkeys ceremony in Watkins Glen, in upstate New York, on Nov. 20, 2011. Emma Jacobs/WRVO hide caption

itoggle caption Emma Jacobs/WRVO

Narragansett and Standard Bronze heritage breed turkeys browse at a farm in Westport, Mass. Stephan Savoia/AP hide caption

itoggle caption Stephan Savoia/AP

Dara Arista, 8, holds a photo of Sheila in front of the tiger's cage at the zoo in Jambi, Indonesia. Poachers had slaughtered Sheila during the night. Steve Winter/National Geographic hide caption

itoggle caption Steve Winter/National Geographic

A technician holds a laboratory mouse at the Jackson Laboratory in Bar Harbor, Maine. The lab ships more than two million mice a year to qualified researchers. Robert F. Bukaty/AP hide caption

itoggle caption Robert F. Bukaty/AP

A jury member feels a piece of duck foie gras during a contest of local producers and producers from southwestern France. BOB EDME/ASSOCIATED PRESS hide caption

itoggle caption BOB EDME/ASSOCIATED PRESS

Racing pigeons are bred to be stronger, smarter and have better endurance than normal pigeons. Patrick Skahill hide caption

itoggle caption Patrick Skahill