It's a Pileated Woodpecker! These are crow-sized birds that are simply spectacular. I didn't have my long telephoto handy so this picture, taken at 135mm, is heavily cropped in photoshop (thus the chromatic aberration around the crest and such).
Check the damage he did to this Beech tree! Pileateds eat almost exclusively Carpenter ants. They look for rotted trees that they believe may harbor an ant colony and then search the tree, actually listening for the sound of ants chewing away the dead wood on the inside of the trunk. When they think they hear munching ants they drill a few test holes in the tree to find exactly where the colony resides. Once they locate it all hell breaks loose as they rip the tree apart, consuming ants as they go.
Look at the size of the wood chips this pecker is chiseling out of this tree! Granted the wood is rather soft but still... that is pretty damn impressive!
I know I'm a dork for getting so excited about birds but I just thought this was so cool and wanted to share. Thank you for letting me do so. And here I thought doing yard work was going to be boring! "Once in a while you get shown the light..."