Can you classify this new quack as a “chatter?” The sound I’m talking about seems to only happen when two or more get “in the mood!”

As a matter of fact, it was quite annoying in the beginning. That’s when I was really upset that Latte was a Ralphie and it seemed that was ALL the ducks wanted to do. It is most noticeable when they get in water, especially clean water. I need to see if I can get a video of them “chattering.” It is a quack, but a really fast quack. And when one starts, they all chime in.
As far as them seeming fussy because you’re around, they probably are. I think they’re in the teenage stage and get ticked when you walk up on them (in their little space). It’s like mom walking up on them doing “new things.”

They kind of get out of that stage though. But they do seem much more secretive, than chickens anyway. My ducks do like scoping out our dog houses too.
And as far as the oyster shell goes, they should begin eating it (when they need it.) To begin with I don’t think they need it, but as time goes on they will. And something I have found out is not only is their shells hard as a rock, the membrane is as tough as nails too. It’s really difficult to break into the things. I feel sorry for those little ducklings trying to free themselves during a hatch.