I'd read that duckling voices 'break' at about six weeks so you can differentiate ducks & drakes. However, I've got an eight week old (feather wise looks like a duck) that is still peeping and a bunch of 2 1/2 week olds inside, some of which are starting to make slightly lower noises - sort of half quacks. Does it vary by breed (the young half quackery are Cayugas, the older peeper is a Silver Appleyard)?
Thanks,
Hester