- grass snake, ring snake, ringed snake, Natrix natrix - harmless European snake with a bright yellow collar; common in England
--1 is a kind of water snake
--1 has particulars: viperine grass snake, Natrix maura - ringneck snake, ring-necked snake, ring snake - any of numerous small nonvenomous North American snakes with a yellow or orange ring around the neck
--2 is a kind of colubrid snake, colubrid
--2 is a member of Diadophis, genus Diadophis