You don't need the humiditynup, but he needs to heat up still. He should detach from the shell, but you can remove the shellmparts not connected to the tissue directly. Congrats on the new duckling.
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Need to leave the lid on so you don't dry the baby out while it is trying to hatch. Ducklings need more humidity and also take longer from Pip to hatch. Where are you here in FL? We just finished a massive Call Duck hatch, over 70 ducklings total out right now.