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Matthew Troutman writes:

>"Othenio Abel (1911) agreed that birds and theropods possessed important
>similiarities and was among those who argued for a common ancestry.  For
>Abel, however, this common ancestor was an arboreal animal.  The avian
>descendents of this ancestor simply remained in the trees, whereas the
>theropods became secondarily terrestrial."  Witmer 1991; 438.

I may be misremembering, but I think I've seen (a) drawing(s) by Abel of
feathered nonavian theropods.  Or maybe it was Nopsca?  Early (pre-1926)
Heilmann?  It was ca. early 20th century anyway.  Quite possible I'm
mistaken, but I thought I'd mention it.

                       --John R. Hutchinson