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. ______________________________________________________________________ Ohio-birds mailing list, a service of the Ohio Ornithological Society. Please consider joining our Society, at www.ohiobirds.org/site/membership.php. Our thanks to Miami University for hosting this mailing list. You can join or leave the list, or change your options, at: listserv.miamioh.edu/scripts/wa.exe?LIST=OHIO-BIRDS Send questions or comments about the list to: [log in to unmask] ______________________________________________________________________ Ohio-birds mailing list, a service of the Ohio Ornithological Society. Please consider joining our Society, at www.ohiobirds.org/site/membership.php. Our thanks to Miami University for hosting this mailing list. You can join or leave the list, or change your options, at: listserv.miamioh.edu/scripts/wa.exe?LIST=OHIO-BIRDS Send questions or comments about the list to: [log in to unmask]