Tom,
My guess is that they are protecting berry resources. They get a little
jumpy over good resources. This is berry eating time!
Best
Kent

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Kent McFarland
Vermont Center for Ecostudies
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On Sat, Sep 7, 2013 at 8:42 AM, Tom Slayton <[log in to unmask]> wrote:

> A flurry of warblers, including at least two black-throated green and one
> black-throated blue (others unidentified) went through my back yard on
> Terrace Street in Montpelier at about 7 a.m.
>    The resident robin seemed much disturbed by this and chased various
> individuals several times. Anybody know about this behavior?
>
>    Tom Slayton
>