One of my hens tails looks like it's got wet look hair gel on it, it isn't actually wet or damp - it just looks like it is. She's also behaving very slow.....when I feed the three of them treats she never seems to 'get in there' and looses out (though I do separate her and give her her own bits!). We also had two days with no egg from her, and today an egg with a very thin shell.
Any ideas?
Any ideas?