Reference for Bekhorot 15:22

והלא בדק יפה

But did he not search thoroughly? - You presume that the greater part [of the egg] came forth from the intestines of the chicken but returned,<span class="x" onmousemove="('comment',' The greater part of the egg came forth from the inside of the chicken on the eve of the Festival, but it returned, and therefore he did not find it when he searched for it at first in the nest. Consequently, even if, as in this case, it laid the egg at night, it is permitted to eat it on the Festival. But it does not, usually, lay eggs in the night time.');">⁸</span>

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