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In page Pillow:
"Though the exact origin is unknown, use of pillows evolved in animals well into prehistory, the earliest examples including reptiles and mammals resting their heads on themselves, and one another, to support the head and neck.[1] Animals, including humans, evolved use of inanimate objects in their nests out of wood and stone as pillows.[1] Since domestication, many animals have also learned to make use of human-made pillows and cushions, as well as to rest on members of own and other species, for this purpose.[1]
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