Under any definition, all living birds, including taxa as diverse as ostriches, hummingbirds and eagles, are descended from basal ornithurans, many of which were semi-aquatic. It is now thought possible that all modern birds descended specifically from a semi-aquatic bird similar to "Gansus". Thus, while "Gansus" is not necessarily a direct ancestor of today's birds, it is closely related to such an ancestral species.= = = Reddit = = =
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