Why would a bird have split wings?
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On my world there is a creature that has a 'split' in the plumage of its wings and tail.
Instead of having a singular D-shaped surface (when viewed from above, the bird facing to the left), it is more of a B-shape.
Why might a bird evolve to have this trait?
(I know evolution is random, but what benefit might the species gain from it.)
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