Sahih Muslim Book 007, Hadith Number 2717.
Chapter : Which animal the Muhrim and the non-Muhrim are permitted to kill in the state of Ihram at the conclusion of it (within the precincts of the Ka'ba).
'Aisha, the wife of the Apostle of Allah (may peace be upon him). said: I heard Allah's Messenger (may peace be upon him) as saying: Four are the vicious (birds, beasts and reptiles) which should be killed in the state of Ihram or otherwise: kite (and vulture), crow, rat, and the voracious dog I (one of the narrators, 'Ubaid-ullah b. Miqsam) said to Qasim (the other narrator who beard it from 'Aisha): What about the snake? lie said: Let it be killed with disgrace.