Why do some animals have venomous fangs?

Venomous fangs are used by many animals as a means of defense or to capture prey. For example, snakes use venomous fangs to inject toxins into their prey, paralyzing or killing it to make it easier to swallow. In some species, like spiders and scorpions, venomous fangs are used for defense, deterring predators with painful bites. Venom can also serve as a deterrent for potential threats, making these animals less likely to be attacked. Over time, venomous fangs have evolved in these species to improve their chances of survival.