I have 2 exchequer leghorn hens and a cockerel in the garden at home and a few days ago the cockerel was crowing and then suddenly I heard this rather strained high pitched crowing. It was nothing like the egg song, it was a cock a doodle doo crow and when I investigated it was coming from one of the hens. Each time Horace cock a doodle dooed, a few seconds later, so did she. I have had them nearly 6 months now and they have been laying for 5 so I know the egg song and I am around in the garden with them a lot and I've never heard her do this before or since. It wasn't the sort of cackle they do when they are alarmed, it was a proper cockerel call, albeit in a high croaky voice. Horace is a bit of a sex pest in the morning and I really need to get some more hens for him to take the pressure off the girls, but surely that suggests it's not a dominance thing since he is obviously fulfilling his role. Thankfully the noise is not a problem for me as I have no near neighbours, it was just very strange!