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Re: Bird vs. theropod dinosaur tracks/trackways




Jason Pedersen wrote:
> 
> 
> >> 1). Why do birds "waddle" (and thus turn their toes inwards) and
> theropods
> >>apparently did not (as manifested by the trackway evidence)?
> >
> >A guess: birds have a wider "carriage" due to adaptation for
> perching?
> 
> >> 2). What skeletal or other morphological feature(s) cause a bird
> to walk
> >>pigeon-toed and theropods not?
> 
> >>the pelvis?
> 
> Flying birds also have a much larger breastplate to support the
> muscles needed to sustain flight, thereby widening the body.
> 
> _______________________________________________________________

        But where does this leave birds like lesser mynahs and robins
and so many of the shorebirds who walk quite straight?

        Blue