Syntax discovered in the warbling duets of wild parrots

With a few minutes of searching, anyone can find videos online of chatty birds: macaws talk to their keepers, cockatoos sing to the camera, corvids mimic the jarring sounds of construction sites. Research has shown that some birds can understand and use words in context—so, when Polly speaks up from inside her cage, she may really want a cracker—but scientists know far less about how birds use their vocal abilities in the wild. Christine Dahlin, professor of biology at the University of Pittsburgh at Johnstown, is working to change that.