The scales on moth wings help camouflage them from predatory bats because their uneven shape prevents the bats' sonar from detecting them clearly.

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"The moth's first defense again comes from those fuzzy scales it has all over its body. To us they just seem ungainly, a mistake. But because of their uneven shape, they give the bat only a fuzzy outline on its sonar scope." (Bodanis 1992:169)

The Secret Garden: Dawn to Dusk in the Astonishing Hidden World of the GardenSimon & SchusterNovember 1, 1992
David Bodanis

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