Hi! I have a Cayuga duck thats 8 weeks old. I was wondering how old he will be until he is fully grown? And at first I thought he/she was a boy but now im really not that sure...When he/she started getting a quack (still is) it sounded kinda low and raspy but now he/she is very quite and never make a noise. When he/she does its not low...but not very high..He/she has a peeping quack. lol Ive gotten use to calling him/her sweet boy but if he/shes a girl it'll have to change to sweet girl.