7 page report about various Swallow Birds, comprising 20 images of
5 different species; Tree Swallows, Barn Swallows, Bank Swallows,
Cliff Swallows and Rough-winged Swallows.
20 images of Swallows flying, nesting, feeding and socializing...

Above: Quite a set of wings for such small birds (Bank Swallow), fabulous flyers.
Below: A lot of chatter going on amongst Tree Swallows during mating seasons.
And a lot of showing off, and “get off my favorite perch” and so on and so forth...
Hard to say if that kind of behavior is aggressive or just friendly interplay.
Probably a bit of both...