Caption:
Hesperornis regalis, extinct species of ancient flightless bird of the late Cretaceous period, descended from earlier flying birds of the Mesozoic Era. Hesperornis.Colour printed illustration by Heinrich Harder from Wilhelm Bolsches Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908. Heinrich Harder (1858-1935) was a German landscape artist and book illustrator.