Ibn ‘Umar said The Prophet (ﷺ) was asked as to which of the creatures could be killed by a pilgrim in the sacred state. He said there are five creatures which it is not a sin for anyone to kill, outside or inside the sacred area. The Scorpion, the Crow, the Rat, the Kite and the biting Dog.
Sunan Abi Dawud Book 11, Hadith 126