DWB, I've never seen that puka block detail here, but similar screened holes in horizontal plywood soffit, in homes from the 70's or thereabouts.
In this case, bird-blocking was left out altogether; not sure why--probably budget. Obviously a duh decision.
I'll see if the HO has a clue as to species. I don't. It is interesting though, that all of the nests are on the east side of the bays. Don't know if that's because our prevailing winds tend to be from the west, or some other reason.
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