I have seen one or two Northern Flickers lately, so evidently they are back in the area. They are among the few woodpeckers that generally migrate. Flickers leave the northern parts of their range to winter in the southern U.S., although a few stay in the same area year round.

I have wondered why I have seen flickers and other woodpeckers drumming on even metal objects, resulting in a loud banging sound. I figured it wasn't because they were musicians. So I found the following information interesting, from 'All About Birds':
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"Like most woodpeckers, Northern Flickers drum on objects as a form of communication and territory defense. In such cases, the object is to make as loud a noise as possible, and that’s why woodpeckers sometimes drum on metal objects. One Northern Flicker in Wyoming could be heard drumming on an abandoned tractor from a half-mile away."