Snake venom complexity is driven by prey diet

Diversity in diet plays a role in the complexity of venom in pit vipers such as rattlesnakes, copperheads and cottonmouths. But new collaborative research found the number of prey species a snake ate did not drive venom complexity. Rather, it was how far apart the prey species were from each other evolutionarily.

source https://www.sciencedaily.com/releases/2021/04/210419195312.htm