PETR JAN JURACKA / SCIENCE PHOTO LIBRARY PETR JAN JURACKA / SCIENCE PHOTO LIBRARY
Butterfly wing scales. Coloured scanning electron micrograph (SEM) of scales on the wing of a Ulysses butterfly (Papilio ulysses). The colour of a butterfly's wing can arise either from a pigment contained in the scales or from the actual structure of the scales themselves.
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