When I go to clean, gather eggs, anything inside the hen house, I get the tiniest of black flea shaped (looked under magnifier) bugs on me...especially in my hair! They don't bite, but they drive me crazy crawling around! I have to get DH to go through my head until he finds and removes it. In many cases, when he opens his fingers to kill it, it jumps off and disappears. The few that we have managed to kill are hard to kill, like a flea. I put Eprinex on the hens and dusted the house with Sevin, but I can't tell any difference in the hen house. When I pick up the hens to pet them, they don't get on me. WHAT ARE THESE VARMITS?? HELP!