David, I'm guessing the Flickers hammered out those holes themselves. That architectural detail seen in the lower photo is mostly for aesthetics. Think of it as molding for the building. If it were a drain, it would be at the lowest point possible to drain away water and there would be a spout or tube to direct water away from the building. I'm speculating here but I imagine the male was looking for a good drumming site and he realized there was a good hollow spot to locate a nest cavity in. Pretty tough bird to hammer through mortar, they have my respect.
Let's hope the buildings' maintenance team waits until the Flickers are gone before patching the holes. I know the Migratory Bird Treaty would have protected them in the past but I'm not sure where that stands now - one more reason to vote for different leadership.
David Wade
Ft Collins, CO
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