Hello, I noticed a small flock of birds the other day and thought those were sparrows at first, but the birds had pointy wings and were flying in a fairly synchronized and acrobatic manner. Swallows are a common sight here, especially during dusk, but I've never seen them in flocks (except in fall when they leave for the season). The brbs were also smaller than swallows usually are. This got me the idea that what I was seeing were young swallows practicing diving and banking together. The flock was going in circles around the neighborhood and returned to the airspace above my garden again and again, so getting somewhere was clearly not the objective. Ever heard of such a thing? (Just curious; google didn't turn up evidence. The birds were also singing constantly, so a platoon of jogging army rookies came to mind.) Thanks.