Black-necked Garter Snake vs. Checkered Garter Snake
Both live along streams, ponds, stock tanks and canals across central and southern Arizona. A: Two big jet-black crescents behind a plain grey head in the Black-necked Garter Snake; a white crescent up the side of the head, in front of dark neck blotches in the Checkered Garter Snake. B: Small black blotches on the front of the body only; the side stripe on rows 2 and 3 in the Black-necked Garter Snake; a black checkerboard all along the body; the side stripe on row 3 only in the Checkered Garter Snake. C: Plain grey or blue-grey in the Black-necked Garter Snake; each eye between two white bars edged black in the Checkered Garter Snake.
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