My RIR has been in moult for about 3 weeks now and looks pretty threadbare. But when I went poo-picking this morning I found an egg that she must have laid (because no other hen I have lays that colour). She is 3 years old, if that makes any difference. I thought laying stopped while moulting was on (and it has for all my hens, including her, hitherto), but evidently this rule has exceptions. So how common is this? Have your hens done it, and if so, does it become habitual, or is this likely to be a one-off?