JACKASS PENGUIN (Eudytes
demersa), a species of penguin which
rises to the surface and again dives with
great rapidity, so that, according to
Darwin, it might be mistaken for a fish
leaping for sport.
Source: “Jackass Penguin,” Collier's New Encyclopedia,
V (New York: P.F. Collier & Son Company, 1921), p. 220.