Abu Dawud Book 4, Hadith Number 1844.

Narated By AbuSa’id al-Khudri : The Prophet (PBUH) was asked which of the creatures a pilgrim in sacred state could kill. He replied: The snake, the scorpion, the rat; he should drive away the pied crow, but should not kill it; the biting dog, the kite, and any wild animal which attacks (man).