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In the wing, there is a wrist, elbow, radius, ulna and even stunted finger bones towards the end. Birds have feathers where mammals have hair, but just as we have two arms and two legs, they have two wings and two legs.
Like all insects, caterpillars have six legs emerging from their thorax. The problem is they also have stumpy prolegs that emerge from their abdomen. Technically these are not true legs, even though they have the same function. Here's a picture of a butterfly caterpillar. You can see on the right, by its head, three pairs of black, pointy legs that it's using to grab the bud it's eating. On its abdomen, holding onto the stem, are the stumpy prolegs: four pairs in the middle and one pair by the rear end.