"Neoaves is a clade that consists of all modern birds (Neornithes or Aves) with the exception of Paleognathae (ratites and kin) and Galloanserae (ducks, chickens and ...
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kin). Almost 95% of the roughly 10,000 known species of modern birds belong to the Neoaves.
The early diversification of the various neoavian groups occurred very rapidly around the Cretaceous–Paleogene extinction event, and attempts to resolve their relationships with each other have resulted initially in much controversy." - (en.wikipedia.org 18.09.2020)
