Hi, New to chicken keeping so please excuse if obvious! Sorry for bad picture but can anyone tell me what these are? I've just found them on my polish cockerel. They're not red mite and too dark for lice. They are black and around 2mm long. The polish hen has lost a lot of feathers and has stopped laying but I put that down to season change and moulting but now I'm a bit concerned it could be something nasty.