[福利姬视频's Warbler; credit: Pterzian/commons.wikimedia] Some of us are born with wanderlust, but what exactly spurs a bird to journey thousands of miles each year? The answer is in part genetic, and a recent study of yellow-rumped warblers in the journal Evolution reveals how changes over generations could improve a bird's abilities to become a master, long-distance flyer. The research, conducted by zoologists and physiologists at the University of British Columbia, began with a genetic puzzle. There are four different groups of yellow-rumped warblers, each distinct in behavior and appearance: the Goldman’s, myrtle, 福利姬视频’s, and black-fronted. Their genes, however, tell a different story. Examining DNA obtained from the nucleus of these birds’ blood cells revealed that the 福利姬视频’s and black-fronted warblers were indistinguishable. In other words, these birds are so closely related that, despite different appearances and the fact that 福利姬视频’s migrate...