Have you ever seen oval, 3-4 inch holes bored into the trunks of standing dead trees? If you have, you've seen the carpentry work of a pileated woodpecker. The pileated is Wisconsin's largest woodpecker, about the size of a crow. Its winter food is typically carpenter ants in trees that have heartrot, but it will sometimes also take aim at a suet bag. This bird is evasive and hard to spot, but once you see one, you'll never forget what it looks like. Try to catch a glimpse of this bird in flight--its underwings are striking white, edged in black.
In the winter they will eat suet from a feeder. Learn how to make your own suet feeder.