eli5: Why do snakes have such potent venom when the prey they eat are normally small in comparison?

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I’m from northern Australia and we have many snakes that can easily kill humans, cattle and other live stock. The power of these snakes venom seems overkill for what is required?

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Anonymous 0 Comments

For a lot of vipers like rattlesnakes, their strategy to not get attacked by prey is to let it go after the bite and track it down to eat it once it’s dead or too weak to fight. Having weaker venom might still kill the prey but it might only do it after it has run too far away to track down, so the vipers with the strongest venom would have an easier time getting food even if they could all kill things.

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