I do not know what anal scent glands are for. Did some reading last night in Harvey Lillywhite's book ("How Snakes Work" - it is a great book, explains things in terms I can comprehend) and they had discussion on pheremones and garter snakes. You know, those huge balls of 100's of male red-sided garters rolling around a female garter in Manitoba, but nothing on cloacal scent glands. Speculating that they serve in recognition of snakes within a population, but I do not know.

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