Thx to all the folks who expl the bluebird behav I observed by the nest box this cold AM at Clr Crk. 

I didn't know that bluebirds used the nest boxes for roosts, esp in cold weather.  One person mentioned that pairs may cont to defend "their" nesting box out of season also. 

Pretty neat--thanks!!

Peggy Wang
Lancaster 

Sent from my iPhone
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