English Rat snake Cited by user Ebrotsl on 21 Feb 2017 Rat snakes are members – along with kingsnakes, milk snakes, vine snakes and indigo snakes – of the subfamily Colubrinae of the family Colubridae.
English Toxicofera Cited by user Limulus on 31 Dec 2007 Detailed cladogram in Vidal and Hedges, 2009; Fig. 2.