It is so frustrating to see a bird on my feeders and I’m unable to match it to my charts and books!!
(Telephoto pictures, through the glass of my living room window.)
Is it a young Cardinal?? However, Cardinals do not visit the Bluebird mealworm feeder!
Three Quarters & Counting 
Look at the woodpecker pictures – maybe
Thank you, Carol. I checked Internet woodpecker pictures and see that the top of head (my picture) has a tiny bit of red so perhaps mine is Redheaded Woodpecker?! And body markings look like woodpecker. (Referring to top image)
This a immature Red-bellied Woodpecker.