In the YouTube video below, what do you call the sac that the mother bird removes from her youngs?

You can find the video on Youtube. It is titled:
“Les 12 premiers jours de la vie d’un Merle”
In case the direct link can be read/deciphered, here it is:
https://www.youtube.com/watch?v=w_CTP1TY9p4&feature=related

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