They build a paper nest by chewing small amounts of wood from trees, reeds or garden fences and mix it with saliva to form a pulp which is added to the nest in thin strips.

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Ribbons of the paper tape piled up at Joe's feet like a nest of intertwined vipers.

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But leave at least six grams of paper in the chilly cage, and many mice will prefer instead to brave the cold and build a nest there.

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