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Kitto's Popular Cyclopedia of Biblical Literature
The law in Deuteronomy 22:6-7, directs that if one falls in with a bird's-nest with eggs or young, he shall allow the dam to escape, and not take her as well as the nest. The reason Maimonides gives for this is, 'The eggs on which the dam is sitting, or the young ones which have need of her, are not, in general, permitted to be eaten; and when the dam is allowed to escape, she is not distressed by seeing her young ones carried off. It thus frequently happens that all are untouched, because that which might be taken may not be lawfully eaten.'
Kitto, John, ed. Entry for 'Birds'-Nests'. "Kitto's Popular Cyclopedia of Biblical Literature". https://www.studylight.org/encyclopedias/eng/kbe/b/birds-nests.html.