Why are some snakes venomous and others are not?

I wasn't going to answer this question but it is still unanswered after a few days so here's my shot at it. read more

In conclusion, some snakes are venomous because of a chance mutation which occurred 170 million years ago that turned out to be beneficial. And, some snakes are not venomous because constriction is still a very effective method of hunting. Evolution is a "whatever works" kind of guy, he's not very particular. read more

Competition with prey is not the only thing driving snakes to evolve more and more toxic venom. Snakes also struggle to avoid becoming prey themselves. Some snake predators have partial immunity to venom. Famously, mongooses are highly resistant to cobra venom, and with their speed and agility, kill snakes with impunity. read more