What's the difference between i.e. and e.g.?
c.1300, "wild drake or duck," from Old French malart (12c.) or Medieval Latin mallardus, apparently from male, from Latin masculus (see male), in which case the original sense probably was not of a specific species but of any male wild duck, though the specific sense of "male of the wild duck" was not attested in English until early 14c.