Sahih Muslim | Book 7 | Hadith Number 2731

Narrated by 'Abdullah b. Umar (Allah be pleased with them)
'Abdullah b. Umar (Allah be pleased with them) reported Allah's Messenger (may peace be upon him) as saying: Five (are the animals) which, it one kills them In the state of Ihram, entail no sin for one (who does it): scorpion, rat, voracious dog, crow and kite.