Analogous structures are structures of similar shape and function, but a different developmental origin.
E.G. Butterfly, sparrow and a bat.
These three organisms all have wings, however, one is an insect, one is a bird and one is a mammal, and so they do not share a recent common ancestor. Instead, their ancestors must have adapted to similar environmental conditions and evolved wings.
This is an example of convergent evolution: the structure has evolved a similar shape and function, but comes from a different environmental origin.
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