Why not take the mother bird? (Deuteronomy 22:6–7)--6“If a bird’s nest happens to be before you along the way, in any tree or on the ground, with young ones or eggs, with the mother sitting on the young or on the eggs, you shall not take the mother with the young; 7you shall surely let the mother go, and take the young for yourself, that it may be well with you and that you may prolong your days.
Deuteronomy 22:6 - 7
ESV - 6 If you come across a bird's nest in any tree or on the ground, with young ones or eggs and the mother sitting on the young or on the eggs, you shall not take the mother with the young. 7 You shall let the mother go, but the young you may take for yourself, that it may go well with you, and that you may live long.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.