Some bluebirds will use the nesting boxes for roosting but "mock " mating
and nesting behavior is normally observed each year  in the fall. Can't
speak on this behavior being normally seen in December, however.

-----Original Message-----
From: Ohio birds [mailto:[log in to unmask]] On Behalf Of
Debra Steinhausser
Sent: Sunday, December 4, 2016 10:46 AM
To: [log in to unmask]
Subject: Re: [Ohio-birds] Bluebirds

I have a nest box trail of 13 boxes.  I observe this kind of behavior
almost every fall.  Some of the bluebirds will stay over the winter. I
haven't observed them using the boxes during the winter, but I don't
monitor them after the nesting season is over--just casual observation.

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