A musk-rat.

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1624.  Martins, Fitches, Musquassus, and diuers other sorts of Vermin.—Captain Smith, ‘Virginia,’ p. 27. (N.E.D.)

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1634.  Rackoones, Otters, Beavers, Musquashes.—W. Wood, ‘New England’s Prospect,’ p. 88. (Stanford Dict.)

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1672.  There is a little Beast called a Muskquash, that liveth in small Houses in the Ponds, like Mole Hills, that feed upon there Plants.—John Josselyn, ‘New-Englands Rarities,’ p. 53. (Italics in the original.)

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1674.  The Musquashes is a small Beast that lives in shallow ponds, where they build them houses of earth and sticks in shape like mole-hills.—The same, ‘Voyages to New-England,’ p. 86. (N.E.D.) (Italics in the original.)

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1768.  “920 Musquash, 59 Wood Chucks, &c.” were slain in the year 1682 as part of an Indian funeral ceremony.—Boston News-Letter, June 30: from the Halifax Gazette.

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1788.  The musquash or castor muschatus, which I have dissected, has no sacs [like those of the American skunk].—Dr. S. L. Mitchill in the American Museum, v. 488/1 (May) (1789).

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1792.  The musquash (castor zibethicus) builds a cabin of sticks and mud in a shallow pond.—Jeremy Belknap, ‘New Hampshire,’ iii. 161.

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1834.  I took most comfort in catching musquash of anything I used to do.—Seba Smith (‘Major Downing’), ‘My Thirty Years Out of the Senate,’ p. 27 (1860).

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