UNITED KINGDOM – SEPTEMBER 09: Hadrosaurs or duck-billed dinosaurs of the family Hadrosauridae were herbivorous dinosaurs of the Upper Cretaceous Period. Colour printed illustration by Heinrich Harder from Tiere der Urwelt Animals of the Prehistoric World, 1916 Hamburg. Heinrich Harder (1858-1935) was a German landscape artist and book illustrator. These images come from a series of prehistoric creature cards published by the Reichardt Cocoa company in 1908. Natural historian Wilhelm Bolsche wrote the descriptive text. (Photo by Florilegius/SSPL/Getty Images)