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Webster's Dictionary (1865)

Hăr'vest-mouse, n.

noun

(Zoöl.) A very small European field-mouse, the Mus messorius, which builds its nest on the stems of wheat or other plants. Partington.

An engraved illustration of a harvest mouse sitting upright on its hind legs, with its long tail curled along the ground.
Harvest Mouse (Mus messorius).