It is narrated from Sayyiduna Ibn Amr (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "Whoever kills even a sparrow unjustly, Allah Almighty will question him about it on the Day of Resurrection." Someone asked, "O Messenger of Allah! What is its right?" He said: "He should slaughter it, not seize it by the neck so as to break it."