Wow, this is so scary! I'm so glad I came across this before I got my chickens so I can be prepared for next year. The past few weeks you can't even go outside to get the mail without being attacked by these gnats- they love to go for your eyes and up your nose! We live on the river and they are just relentless here as we are in the middle of their breeding grounds. They are starting to get better now thank goodness but I better start planning my plan of attack for next spring so my chickens will be safe. I'm so sorry to everyone who has lost their chickens to these nasty creatures.