I have 6 hens in a pretty good sized shared coup. Wasn't watching (enough) when teenager kids were taking care of the hens, they are now invested with stick fleas. We live in florida so it doesn't get real cold. To many to hand tweeze them off. We have dipped them with flea dip being careful not to get in their eyes and used olive oil around face, b/c we heard it helped kill the stick fleas on their head without hurting their eyes. It's helping but we can't seem to get them killed off inside the coup nor completely off their heads etc. We lime the coup something someone said to do on here. ANY ADVICE, I love my hens but the flea problem is taken over!!