While on the trail at Cooper Mountain Nature Park I came upon an open meadow area. I typically don't find as many birds in open areas, but on this occasion I notice a couple of tree swallows swooping around, at one point perching at the top of a pine. They were typically quite a ways from me and they flew quite fast, but I tried my best to keep up with them. None of the pictures are technically very good, but each shows a little different aspect of the birds. I decided a posting of several of them was better than 1 or 2 mediocre ones.