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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.
The reason I emphasise the fact that adult insects have six legs, is that in their larval form, in this case caterpillars, insects often have more than six leg like structures, called 'proto legs' if memory serves, that aren't legs, strictly speaking, and are lost during pupation.