Assuming that within a population of kingsnakes, those that survive and "prosper" leave their scent, however faint, whereever they trvael. Being crawlers, they are constantly in touch with the ground. Scent is constantly emited. Neonates key in on the scent and essentially follow the trails of the successful earlier generations. Those who wander too far from the "safe" trails either colonize new habitat or become lunch. The scent left in nature was put out by those that survived. The scent of the "failures" becomes fainter and fainter, gets washed away with rain, etc. Snakes have incredibly developed sense of smell (all that vomeronasal stuff) and they ain't got no legs! Always right on the ground where the scent is.

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