Most poisonous snakes have both neurotoxic and hemotoxic
and the venom dominance can vary even within the same
family of snake. These differences within the same
family of snake usually occur due to in habitat, prey
and geographic location. It's extremely important
not overgeneralize any species here. For example, a
American Rattlesnake has hemotoxic venom, while Mexican
Rattlesnakes usually have neurotoxic venoms.