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A fly's foot is covered with hairs, which are sticky at the end and adhere strongly enough to anything they touch to carry the fly's weight.
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They secrete a sticky substance from their footpads that helps them hang on.
Just curious, where did you find that life-like photo?
The structure of a flies "foot" has micro "hooks" (as seen under a microscope)
No one told them they coldn't, so they don't know any better.
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