Sayyidah Umm Kurz al-Ka'biyyah (may Allah be pleased with her) narrates from the Prophet (peace and blessings be upon him): "For a boy two sheep and for a girl one sheep are to be slaughtered in the aqiqah; it does not matter whether they are male or female." And I heard him (peace and blessings be upon him) say: "Leave the birds in their places."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19336