Hi, my beloved Daisy ( my favorite chicken) isn't looking to well. She's alert, eating, laying eggs, and all of that. But I checked her neck and it's all pinfeathers! I thought it was normal, but today I was looking at it and I saw a little bug. I have no idea what it is, but I'll describe it (On the feather tips) It looked kind of grum like, it was VERY small, but if you looked, you could see it, it looked yellowish, I couldn't tell since I looked so fast and ran inside.. I havn't seen this before. what shouldI do? I have 13 other chickens and don't want them to be infected if this is a tick/mite. It might just be a random bug, but I've never seen it before. Please help.