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Re: Ah ha! That's where therizinosaurs came from



Don Ohmes <d_ohmes@yahoo.com> wrote:

> No photos -- it is just my observation, which necessarily makes it a mere
> anecdote to you.


Good enough for me.


> It should be noted that here in the SE US, turkeys roost in trees nightly,
> usually over or near water (i.e., in swampy areas).


The turkey hallux is nothing to sneeze at.  The foot is eminently
capable of perching - such as during roosting.  The hallux of turkeys
is nevertheless much shorter and higher on the foot compared to
specialist perchers like songbirds, and even certain galliforms like
cracids (curassows, guans, chachalacas).  As crown birds, galliforms
inherited a reversed hallux, and could tweak the length and incumbency
of this digit depending on their lifestyle - specifically the bird's
place on the arboreal/terrestrial spectrum.  A long, incumbent hallux
is great when negotiating tree branches in search of food, but is an
impediment during cursorial locomotion.  Turkeys have struck a
compromise.






Cheers

Tim