ducklings?

harpo has been brooding a nest for 14 days.  she started with 9 eggs but there have been a few losses and there are now 6 eggs.  i candled them with a flashlight today and they're all looking good.  i took a short video of one of the eggs while i was checking them out.  the shadow of an embryo is just visible moving around inside the egg.  pretty neat stuff.  

* not sure what the tapping sound in the video is.  may have been the ducks messing with something outside the shed while i was recording.