They're made of chitin, the same stuff that insect exoskeletons are constructed from.
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(Woo Can ChunderWord to your mums, I came to prod bums, Wed 19 Nov 2025, 23:24,
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There is one right that is consuming wood, lol. But can't get nitrogen from wood, lol. But they make a little lasso out of some tentacle and catch nitrogen rich microscopic worms . Wood, lol