Researchers in Australia found that when they removed mistletoe from large sections of forests, vast numbers of birds left. BSIP/UIG via Getty Images hide caption

itoggle caption BSIP/UIG via Getty Images

A recent study in the British Medical Journal concludes that Rudolph's nose is red "due to the presence of a highly dense and rich nasal microcirculation." Ann Johansson/Corbis hide caption

itoggle caption Ann Johansson/Corbis

Chimpanzees check out a termite mound at the Chimp Haven sanctuary in Louisiana. Chimp Haven hide caption

itoggle caption Chimp Haven

For centuries, Russians believed putting a brown frog in their milk would keep it fresh. Now scientists are finding chemicals in the frog's slimy goo that inhibit the growth of bacteria and fungi. Stefan Arendt/Corbis hide caption

itoggle caption Stefan Arendt/Corbis

Researchers used this inflatable tree raft that sits atop the forest canopy to help them collect almost 130,000 arthropod specimens from a section of Panamanian rainforest about the size of a football field. Courtesy of Noui Baiben hide caption

itoggle caption Courtesy of Noui Baiben

The Lamar Canyon pack's alpha female (right) was shot and killed by a hunter on Dec. 6. Courtesy of Doug McLaughlin hide caption

itoggle caption Courtesy of Doug McLaughlin

Apatosaurus (right, opposite a Diplodocus skeleton at the Carnegie Museum of Natural History in Pittsburgh), is what paleontologist Othniel Charles Marsh actually found when he thought he'd discovered the Brontosaurus. Joshua Franzos/Carnegie Museum of Natural History hide caption

itoggle caption Joshua Franzos/Carnegie Museum of Natural History

A stray cat rests at the Torre Argentina ruins in Rome in October. Officials say a cat shelter that sits adjacent to the site must be shut down. Filippo Monteforte/AFP/Getty Images hide caption

itoggle caption Filippo Monteforte/AFP/Getty Images