When you think about it, is there any other animal so in contact with the ground as a snake? Not many. Even (most) lizards are up off the ground on legs. Snakes are either crawling over ground or burrowing in it. Always in contact with it. Scent is crucial to them. What about those marine seasnakes? Never touch the ground, live in the ocean. Do they have scent glands? Do they have such a well developed sense of smell? Why would they need it in the ocean?

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