December January birds are fully feathered without pin feathers and blood feathers which leave uneven areas in mounts this time of year. Just going with the season as it stands if you must mount a release site or wild bird get one as late in November as you can.
Call Brian Starkevich at Starkys Taxidermy. Fair price, solid work and good turnaround time. He's done a pile of stuff for me over the years and I've never been disappointed. He's in the city, north end.