This is something I’ve only seen once before in Delaware. It’s a Pileated Woodpecker (Dryocopus pileatus). It’s a crow-sized bird and close relative of the somewhat mythical Ivory-billed woodpecker. It makes a tremendous drumming when it’s doing its’ thing, which is how I was able to spot it. Not a very good picture, but not bad for an animal that’s so skittish.