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Re: Walking dromaeosaurs

Quoting Aspidel <aspidel@wanadoo.be>:

> This morning I was watching  _Motacilla alba_ walking: this bird moves its
> neck front-and-back all the time when walking and moves its tail up-and-down
> to keep its balance.

I'd say front-back head movement is likely, but most birds don't do the tail 
movement:  it's a distinctive feature of this particular group of species, as 
reflected both in the Latin "motacilla" ('moved-tail') and in the 
English "wagtail".

Nick Pharris
Department of Linguistics
University of Michigan