What likely drove the evolution of the kingsnake's venom resistance?

Answer

Gaining a reproductive advantage by securing a high-calorie food source others avoided

This resistance likely developed over millennia as an evolutionary arms race, where snakes tolerating the venom gained an advantage by securing a reliable, high-calorie food source.

What likely drove the evolution of the kingsnake's venom resistance?
venomimmunitysnakeRattlesnakeKingsnake