For those of you who dont know the Cliff Swallow they are in the Martin family. They build mud nest that look like a hornets nest when you first see it. I have several in the last few years that have taken up their summer vacation here, yes they are migratory birds. I have around 50 plus nest under the eave of a shop building. Its around 20 feet high. Until the last few weeks I had never noticed them doing anything except building nest and catching insects. However the last few weeks since its been raining most ever day I have been looking out the shop door alot and have really noticed these Cliff Swallows at work helping the Hawk problem. Hey these little fellers will simply drive a Hawk insane and will not stop till he is long gone. I have seen other birds work at this but let me tell you these are the best! I just wish they didn't leave for South America in the winter.