What’s happening to the chick on Day 12?

The lower eyelid continues its progress growing upwards and now covers between two thirds and one quarter of the eyeball.  Feathers are growing around the ear and upper eyelid and the spine is covered with a very fine down.  And as the embryo continues to take calcium from the eggshell, it uses it to harden the toes, claws and ribs.

Day 12

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