I agree with rfarris1, it seems to be a male Downy rather than a Hairy Woodpecker. The Downy has a smaller beak than the Hairy and is slightly smaller.
I've purchased from the a couple of times and sold stuff to them. Have always gotten good service. Bought on lens that wouldn't hold focus and returned it. No problems, they refunded my money promptly. y problem is I have the lenses I really need, but they keep advertising and tempting my budget.
Do the overhead lights have a mesh-type guard over the light bulb? I have seen these in sports venues, apparently as a protection against glass falling on the playing area. You could be picking up a faint shadow from them.
I'm having fun today with my 5DSR and Tamron 150-600 sitting in the woods, waiting for a big deer to come by. Have seen 2 does and a fawn so far. They all came within 15 feet of the tent I am in. They did not seem to detect me.
How will a lens designed for APS-C crop sensor camera function if I attach it to a full-frame camera? What difference will it make? Thanks for helping an old man understand these technical concepts.