A tiny broken bone, misidentified for decades, has upended scientists’ view of bird evolution.
For nearly 200 years, zoologists have divided birds into two categories: those with mobile joints in their upper jaw that allow their upper beak to move, and a much smaller group, including ostriches and emus, with a fused upper palate that gives them a less agile upper beak.
“It’s changing how we’ve been looking at the evolution of birds since the time of Linneaus,” says Christopher Torres, a paleontologist at Ohio University, Athens, who was not part of the new work. “We thought we had this worked out centuries ago, and now we’re finally finding fossils that are showing that we didn’t. We got it mixed up.”Juan Benito and Daniel Field/University of Cambridge
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