Question

mention any other primitive features of bird. Please give answer fast.

Answer 1

primitive bird like "stem-birds" that lie outside class Aves proper in the group Avialae have been found dating back to the mid-Jurassic period. Many of these early "stem-birds" such as Archaeopteryx were not yet capable of fully powered flight and many retained primitive characteristics like toothy jaws in place of beaks and long bony tails.