Tonight I went to close up the coop, as it just turned dark, and gather eggs. When I got inside my house with the eggs,I noticed mites crawling on the eggs. I went back to the coop with a light and saw them on the roosts, and nest boxes. Some where clear and some black. Very tiny. First time I have ever seen them. I just put in fresh hay a week ago, wondering if they came from that. Any ideas on what kind and how to get rid of them?