Swallows nest

There is a nest of swallows in my henhouse. They are very clever birds, this morning I saw a predatory bird circling over my yard, I have small chickens, so I have to be careful, it was the first time I saw this bird. After the moment, swallows flew together and started circling and screeching around it and also attacking it. The bird (I think it was a falcon) fled from the horizon... The group of swallows won! They are defending their babys and also my chickens!