I believe that mosquitos can transmit the illness called "Fowl Pox" to chickens. I haven't noticed them being really bad this year, where I live, but they always seem to bite me! I found this tip somewhere....can't remember where....If you will just keep a fabric softener sheet somewhere on your body, (any kind-generic even), the mosquitos don't like that, and you won't be bitten. So, I tried it out, only I rubbed the sheet on my arms, legs and neck.....Anyhow, IT WORKED! I wonder if you couldn't stash a few fabric softener sheets around in the coop and run.....