If you looked at the previous clip of egg 2 hatching, you might have asked "Where is the eggshell from egg 1, which hatched earlier?" This clip shows us the answer.
Here we see the mother eating eggshell 2. Female bluebirds either eat the leftover eggshells or carry them out of the nest. By eating them, they can recapture the calcium that they lost in manufacturing the egg.
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