Long-tailed pangolins (Manis tetradactyla), like other pangolins, have overlapping scales to act as body armor, and they are the only mammals with scales. The scales are made of keratin, which is the same substance that makes up the hair and nails of humans.
SciArt by Frederick Polydore Nodder for George Shaw, The Naturalist's Miscellany, Vol. 1 (1789-1813).
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