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Re: *Microraptor* the biplane: published
What sort of fossil would cinch either side? If there definitively *was*
biplane stage, what might we one day find?
At least two double-decked basal bird clades.
If there definitively *was not*
a biplane stage, what would we find instead?
At least two single-decked basal dromaeosaur clades ("dromaeosaur" here
actually meaning "everything closer to *Microraptor* than to birds").