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Emperor penguins are seen in Dumont d'Urville, Antarctica in this file photo from April 10, 2012. Scientists on October 7, 2015 unveiled the most comprehensive account of the avian family tree ever formulated, detailing how modern bird groups are connected based on genome-wide data from 198 living bird species. They focused in particular on understanding the group called Neoaves, encompassing more than 90 percent of all birds. (Photo by Martin Passingham/Reuters)
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