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Anatomically Correct Xenomorph

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Xenomorphs are one of the most dangerous, deadly aliens in movie history. They breed in massive numbers, live in an ant-like society, and have blood that doubles as concentrated acid.

Most of those aren't a problem to figure out as we have many creatures on Earth with those. The biggest difficulty with designing this creature lies in its blood. As far as I know no creature, anywhere on earth, ever has had acid blood.

What would the evolutionary history be for a creature with acidic blood?

A list of all of the Anatomically Correct questions

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This post was sourced from https://worldbuilding.stackexchange.com/q/40985. It is licensed under CC BY-SA 3.0.

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