My girl that is in quarantine for an eye injury has been singing. Very soft, cooing noises. I have never had a hen make this noise (that I am aware of). Almost like she's humming a lullaby or something, it is a very soft, gentle noise. A mix between a pigeon's coo and a song. She is not in any distress, she seems to direct most of it at the rooster beside her. Sometimes she 'sings' to the other chickens outside. Anyone else had a singing hen? It is quite pretty! I haven't had her long enough to name, so her name is Melody.