Early birds may have dropped teeth to get airborne

 作者:咸雁     |      日期:2019-03-08 03:16:13
FAD dieting wasn’t an option in the Cretaceous, so the earliest birds went to more extreme measures to address weight issues: they lost their teeth. Archaeopteryx, at 150 million years old still the oldest known bird, had an imposing set of teeth. But within 20 million years, at least some birds were toothless. Now a team led by Zhonghe Zhou at the Chinese Academy of Sciences in Beijing believe they know why. They discovered Zhongjianornis yangi,