Modern birds are the only group of Mesozoic birds to have survived after the K/T extinction event, and recent ornithurine discoveries lend further support to the Cenozoic origin of the modern avian groups.

• 现生鸟类是白垩纪与第三纪之交绝灭事件发生之后的幸存类群，近来今鸟类的新发现也进一步支持了现生鸟类起源于新生代的推论。