ringneck snake

any of a genus (Diadophis) of small colubrid snakes with a yellow or orange ring around the neck, common throughout North America

See ringneck snake in American Heritage Dictionary 4

noun
Any of several small nonvenomous snakes of the genus Diadophis, having a bright reddish or yellowish underside and a yellow or orange ring around the neck, widespread in the Unites States and Central America.
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