My husband made an interesting observation this morning that had not occurred to me. Peanut doesn't quack. She's definitely a girl because she makes all the little squeaky sounds like the other hens do, but she's never full on quacked. If anything she peeps still and my husband calls it squacking. LOL I don't think her being "the runt", so to speak, has anything to do with it because she's now just as big as the other hens. She was the last to hatch, 3 days behind the others, so for awhile she was significantly smaller but has now caught up. She just doesn't quack. Ever heard of a duck that just squeaks and peeps?