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Various thoughts re: implictions of _Microraptor_ and bird flight origins
Just tying some various threads together:
A) At present we have absolutely no (count them, no) evidence that the
elongated leg feather condition was present outside of (DELTRANS
optimization) _Microraptor_ or (ACCTRANS) Deinonychosauria. There is at
present, given currently known specimens and most well-supported
phylogenies, no reason to suspect this trait was present in the lineage
leading to birds.
B) In my view, Dial's discovery demolishes the split between "ground up" and
"trees down": it shows that people have been talking at cross-purposes.
Despite what people have been arguing for years, this isn't an "either/or"
situation, but might better be explained as two different steps in bird
flight origins, with Dial's Wing-Assisted Incline Running (WAIR) as the
functional missing link between the two.
C) "Butt-fans". Now that's a different way of putting it!
Thomas R. Holtz, Jr.
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Phone: 301-405-4084 Email: email@example.com
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796