I have 10 duck eggs (WH and Pekin/swedish/KC) on day 23 in the incubator.  All 10 are active but 6 of them still have clear bottoms. (top being the air sack)  And, I have 1 that is completely dark and looks like it could hatch any day.  Is it normal to still have clear areas at this stage?  Thank you.
	
		
			
		
		
	
				
			
			
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