Depending on your editing software there should be a Selection Tool to do that for you. It might work intelligently on its own, or you may need to tweak it a bit as you go. Basically you want to select the bird and then Invert Selection so it includes everything except the bird and then Cut the selected background out of the photo.
Without actually seeing the Pileated Woodpecker and how entwined the background is to the bird, it's hard to coach you on what all needs to be done, especially if I'm not familiar with your editing software. I'd be willing to try and do it for you, which would probably be easier than me trying to explain how to do it. If you just want results, I might be able to help, I'll PM you my email if that works for you. If you want the education so you can do it yourself, YouTube tutorials for your specific editing software would probably serve you better.