The road from Reptiles to Birds is by way of Dinosauria to the Ratitae. From Wordnik.com. [Life and Letters of Thomas Henry Huxley — Volume 1] Reference
Lastly, among the primary divisions of birds we find a purely terrestrial group -- the Ratitae, including the ostriches, cassowaries, etc.; other great groups, including the ducks, cormorants, gulls, penguins, etc., are aquatic; while the bulk of the Passerine birds are aerial and arboreal. From Wordnik.com. [Darwinism (1889)] Reference
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