Here is draw down. The black line was at lockdown, the blue was day 14. This is a chick egg, but ducks do the same thing. See how low the air cell is on the top side, and how its curved up into the fat end? The baby gets into position, and this happens. They will usually pip right where the air cell meets the shell. This is why some people think a pip may look low, but once it draws down, they are actually into the air cell much lower.
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