Great Photos!
  Maybe it was attempting to puddle and was trying to trying to mix up the ground with some "saliva"?
I see by your pics that it has it's Proboscis down on the very dry looking ground. 


Terri Armata Bennington

On Jul 29, 2013, at 3:29 PM, Maeve Kim wrote:

> Today at the Brilyea Access to Dead Creek, I spent several minutes watching a Giant Swallowtail that looked as if it was dancing. It stayed in one place for many seconds, almost a full minute once, "stomping" or shuffling its feet as it turned in a tight circle. Then it would fly just a few inches away and start the process again. Does anyone know what was going on?
> 
> A few photos are at:
> 
> http://www.flickr.com/photos/86960264@N05/
> 
> Maeve Kim
> Jericho Center