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I too witnessed this behavior between two philadelphia vireos at dead  
creek yesterday. They opened their bills and pecked them together  
several times, hard enough that I could hear the clacking. Any one  
know why they might do this?

-Tyler



Quoting Chip Darmstadt <[log in to unmask]>:

> This morning's bird walk at the North Branch Nature Center was a productive
> one. We had two very cooperative Philadelphia Vireos putting on a show. I
> can now say I've seen the inside of a Philly Vireo's mouth! The two birds
> were feeding in close proximity to each other, punctuated with frequent
> chase scenes and a curious display in which both birds faced each other with
> beaks wide open.
>
> Also on the walk were the following warblers.
>
> Magnolia Warbler
>
> Nashville Warbler
>
> Black-and-white Warbler
>
> American Redstart
>
> Black-throated Green Warbler
>
> Common Yellowthroat
>
>
>
> Our next walk will be Friday, September 14 at 7:30am here at the North
> Branch Nature Center in Montpelier.
>
> Best, Chip
>
>
>
> Chip Darmstadt
>
> Executive Director
>
> North Branch Nature Center
>
> 713 Elm Street
>
> Montpelier, VT 05602
>
> 802-229-6206
>
>  <mailto:[log in to unmask]> [log in to unmask]
>
>  <http://www.NorthBranchNatureCenter.org> www.NorthBranchNatureCenter.org