[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
RE: Feathers for T-rex?
> From: email@example.com [mailto:firstname.lastname@example.org]On Behalf Of
> Dann Pigdon
> "Sticht, Aaron" wrote:
> > I think it is very plausible that at least the young t-rexes had some
> > feathery coating, and possibly even ornamental feathers
> adorning the heads
> > of the adult rexes.
> Feathers need to be kept clean is they are to function properly as a
> display device. How could adult tyrannosaurs possibly clean feathers
> on the top or back of their heads? At least dromaeosaurs could likely
> reach that area with their long forelimbs.
I think you are pre-supposing complex feathers here (i.e., Stage 3 or higher
in Prum & Brush's nomenclature). Since tyrannosaurs lie below the node for
which Stage 3 feathers are synapomorphic, it is as likely they had only
Stage 2 feathers (tufts of unbranched barbs attached to a calamus). One
would wonder how much maintainence these tufts would require.
(This might be similar to, for example, big-bodied mammals like rhinos who
have no real way of preening in the fasion of cats and dogs and so forth).
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