I have 8 st. run pekins that are 6 weeks old. Some are really quacking others are still peeping. When do drakes get a much more raspy voice? Every time I think I know what I have they seem to change. I've laughed at myself several times for listening to videos posted and reading other posts and I'm still just guessing it seems. I can figure out some that really quack but others seem to still peep. Those are the ones that confuse me. I found a video on youtube that shows an adult drake and duck then a young drake and duck. I could hear the difference in the video but then could not tell the difference in mine. Maybe I need to take one duck at a time to a separate area to make sure that others are not confusing me when I hear them. Thoughts? Thanks!