Primitive men with spears hunting a glyptodon (Greek for "grooved or carved tooth") a large, armored mammal of the family Glyptodontidae, related to the armadillo.. 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.