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From story
What Makes an Insect?
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Large White Caterpillar

Caterpillars might have they craziest anatomy of all. If you look closely, you’ll see that they have far more than 3 pairs of legs. But we know that insects only have 3 pairs so how can this be? The secret is that only 3 of those pairs (usually the front 3) are actually real; all their other legs are called prolegs (pseudopods) or fake legs! They might look like legs, but they aren’t!

Image: © Leeds Museums and Galleries