The pileated woodpecker is the largest woodpecker that we have here in Minnesota, they are just slightly smaller then a crow. They are so large that the holes that they excavate in trees in search of ants often attract other birds. These holes are usually rectangular in shape.
Pileated woodpeckers stay on territory all year long. Both male and female will defend the territory, although they are more tolerant during the winter. They nest in a cavity that they excavate typically in a large dead tree. The nest is not lined but usually contains wood chips left over from the excavation process.