What a weird sound came out of a 12-week Australorp last week - thought it had a digestive problem and was watching it closely for illness. Now there is far less peeping from the 3 month girls, and the beginning of what will evolve into clucking. Do they ever sound odd right now. When they cluster together to sleep (still like chicks), they make peeping sounds = I am a baby, don't hurt me, I'm friendly, I'm here with all you other babies. Young horses do this - they clack their teeth together.