- 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 - garter snake, grass snake - any of numerous nonvenomous longitudinally-striped viviparous North American and Central American snakes
--2 is a kind of colubrid snake, colubrid
--2 is a member of Thamnophis, genus Thamnophis
--2 has particulars:common garter snake, Thamnophis sirtalis; ribbon snake, Thamnophis sauritus; Western ribbon snake, Thamnophis proximus - green snake, grass snake - either of two North American chiefly insectivorous green snakes
--3 is a kind of colubrid snake, colubrid
--3 is a member of Opheodrys, genus Opheodrys
--3 has particulars:smooth green snake, Opheodrys vernalis; rough green snake, Opheodrys aestivus