Summer swarm of Barn Swallows fluttering on an electric pole.

I was surprised to see this large flock of barn swallows gathering on this electric pole near a river park. I don't think I've seen this many at once before. A quick update for 9/7/24, I realized watching this later that there are probably some shore swallows and tree swallows mixed in with the barn swallows based on the lighter colors of some birds captured in the video.