Musnad Ahmad 27:14

Hashim narrated to us, Yahya bin Sa'id, and 'Ubaydullah bin 'Umar, and Ibn 'Awn informed us, from Nafi', from Ibn 'Umar, that the Prophet, peace and blessings of Allah be upon him, was asked: "What may the person in Ihram kill?" He said: "He may kill the scorpion, the little vicious one (the mouse), the kite, the crow, and the biting dog."