Collier's New Encyclopedia (1921)/Jackass Penguin

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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.