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Most caterpillars with conspicuous ornamental spikes and spines are actually not venomous.
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Are black and brown wooly worms poisonous? The more black there is, the more severe the winter. If their rusty band is wide, then it will be a mild winter. Woolly bear caterpillars-also called woolly worms-have a reputation for being able to forecast the coming winter weather. What does it mean when you see a black and brown Wooly Worm?
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