In July came home from work one day and found many, many small brown, birds flying frantically around the property, the goat pen was full of them. They are a little smaller than a sparrow. In a few weeks I noticed the horse fly population was down quite a bit and nearly completely gone. Then I started watching these little guys. They would hop, jump, swoop, at the flies taking them right out of mid air. They took them right out of the bushes and grasses. They collected straw, hay and grain and off they would go for the night only to return in late afternoon for a feast. Then on day they were gone. Not sure what they were but hope they come back next year.