Venomous snakes typically have an immunity to their own venom, so they will not die if they bite themselves. This immunity is due to certain adaptations in their bodies, such as specialized proteins that neutralize the venom's effects. While the venom can still cause some damage, it is unlikely to be fatal to the snake. However, it's worth noting that venomous snakes can and do die from other causes such as injuries, diseases, or environmental factors.