Evolutionary Tree (IMAGE)

The University of Hong Kong

Evolutionary Tree

Caption

Graphical abstract showing a simplified version of the revised evolutionary tree of birds (Avialae) and their closest relatives (non-avialan theropod dinosaurs) and the many ancestors that came close to powered flight potential (orange) but the few that achieved it (green; at least three times: once in early birds and twice among the dromaeosaurids ('raptors').

Credit

Michael Pittman and co-authors

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