Musnad Ahmad 1153:894

'Affan narrated to us, he said: Hammad bin Salamah narrated to us, he said: Hisham bin 'Urwah informed us, from his father, from 'Aishah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Five are vicious (fawasiq) that may be killed in the state of Ihram and outside of it: the biting dog, the mouse, the kite, the crow, and the scorpion."