capybara
noun
a South American tailless rodent, Hydrochaeris hydrochaeris, living along the banks of rivers and lakes, having partly webbed feet: the largest living rodent.
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Thus the flesh of the agouti is forbidden, lest the child should be lean, and that of the capibara or water-cavy, for fear he should inherit through his father’s gluttony that creature’s projecting teeth.
From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" by Various