A question for the entomologists among you. Insects breathe through tracheas and therefore cannot grow larger than 17 centimeters at our current oxygen concentration (says the first article I found on Google).
So my question is whether scorpions are bound in the same or a similar way. Google could not really help me in this regard.
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Scorpions breathe through [book lungs](https://en.wikipedia.org/wiki/Book_lung), so the mechanism is different, but they still don’t breathe actively, so that limits the gas exchange much like in insects.
Some other arthropods, like crabs, breathe through [branchiostegal lungs](https://en.wikipedia.org/wiki/Branchiostegal_lung), so they can get quite large – the [coconut crab](https://en.wikipedia.org/wiki/Coconut_crab) can grow up to 40 cm body length and 1 m leg span.
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