Ant, bee or wasp nests... Which kind of hole is this?

Green bees were investigating these holes. Only the one posted previous to this seems to have used any of the holes on this porch post. I did put out a bee hotel and got one of those holes filled, but not these. This set is on the north side of the post where morning light hits the stones, but not the nests under the capstone.

This is a combination. If I remember correctly I saw a wasp place a couple tubes perpendicular to the one that is most recognizable in this photo. They hatched out sometime the next year. Then something made a nest in those holes and it seems it might be a leafcutter bee, as there is what looks like plant material in the hold left of center. I think there were two or three holes filled like that. Then another nest was built across those, blocking them in. See June 12, 2018, as there are holes in these that indicate something hatched and cut its way out.

This pile of sand used to sand the road in winter became a nest site. I can't remember if I saw any bees or wasps that looked like they were nesting, but there was a black spider wasp inspecting the different holes--looking for lunch maybe?