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UPDATE: I was not paying close enough attention to size. If the feces is as small as the OP mentions in the comment below this post ("20+ of these scat in an acorn"), then this is very unlikely porcupine!! Instead, the size and shape suggests the feces belong to either a rat (perhaps wood rat) or some type of squirrel. I await an update form the ...


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Color is a characteristic of visible electromagnetic spectrum, see the graph here. Electromagnetic means here that it has the same nature as radio-waves, X-rays, and gamma radiation, whereas visible refers to the region of spectrum - waves of frequencies ranging from TeraHertz to PetaHerz (i.e., from $10^{12}$ Hz to $10^{15}$ Hz). Specific colors essentially ...


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