I've seen titmice do the same thing with a raccoon--who seemed more puzzled 
than anything else.  I've read that it is nesting behavior.

Mary Young
Hanover Center


I watch a pair of tufted titmice 'attacking' a gray squirrel sitting on a 
limb.
Though several minutes went by, the squirrel was not particularly annoyed or
very agitated.  As I watched it became clearer that the birds seem only
interested in pulling hairs from its tail. The squirrel finally repositioned
himself with his tail tucked underneath and the birds flew on.   Spring
[nesting] behavior?...new to me. 

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