At Fort Rock State Park, Lake Co. Oregon, I have seen flickers using
holes in the basalt as nesting/roosting sites. The volcanic intrusions
that result in such sites as Smith Rocks, Fort Rock, etc. often have
numerous cavities that are taken to by species that would use the same
situation in a tree or fence post or whatever.

On Thu, 23 Mar 1995, Skip Russell wrote
>
> In addition to the other species Dean mentioned, there was a pair of
> Flickers that caught my interest. They came and went frequently, each
> time disappearing into a cavity in the bare rock face! Has anyone ever
> seen this before? This isn't the soft grainy sandstone that crumbles in
> your fingers, but hard rock that climbers hammer pitons (or whatever
> they're called) into. It brought to mind the image of the woodpecker in
> Sill's book, "Little Known and Seldom Seen Birds", that lives in petrified
> forests!
>
> Skip