Have you ever had a bird imprint left on your window after a bird hit the window. I have had the perfect image of a bird just as described in this article. (Fortunately the bird flew away.)
"As bird feathers break down, they produce a fine powder that coats other feathers when birds preen. This feather dust helps to waterproof the feathers. The dust is also what left that amazingly detailed imprint on the window glass. It's like a fingerprint."
Gary Bogue: Birds: How they leave their silhouettes on your windows
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