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Related to protoavis: archeopteryx
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most primitive avian type known

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Lacking such clear evidence, Chatterjee turns to other parts of the Protoavis fossil in making his case that the animal was a flying bird.
The jaw of Protoavis holds another key place in the bird arguments.
Chatterjee also reports that Protoavis had enormous eyes, a finely developed sense of hearing and a highly specialized brain--all characteristics that extend the similarity with birds.
While he plans to detail these features in a future monograph, Chatterjee believes the skull alone qualifies Protoavis as the oldest known bird.
Gauthier, who has examined the actual Protoavis specimens, says most of the bones are poorly preserved, making it extremely difficult to identify many of the features important to Chatterjee's argument.
Gauthier believes the Protoavis fossils may actually represent bones for several different kinds of animals mixed together, an opinion shared by Storrs Olson, a leading authority on fossil birds with the Smithsonian Museum of Natural History in Washington, D.
He thinks that Protoavis could fly between trees in the tropical forest it lived in, but not much farther.
Ostrom calls the Protoavis fossils "anextraordinarily improbable discovery" because the fragil bones of birds are rarely preserved this well.