Eberhard August Wilhelm von Zimmermann traveled through Europe and conducted research on economic conditions and natural resources, where he wrote Specimen Zoologiae Geographicae Quadrupedum (1777), one of the first works on the geographical distribution of mammals, a group of vertebrate animals characterized by the presence of mammary glands.
During his career, he travelled widely throughout Europe  Livonia, Russia, Sweden, Denmark. On his journeys, he conducted research of economic conditions and natural resources. He wrote Specimen Zoologiae Geographicae Quadrupedum (1777), one of the first works on the geographical distribution of mammals (zoogeography). Mammals (from Latin "breast") are a group of vertebrate animals constituting the class Mammalia (/mmeli/), and characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or hair, and three middle ear bones. 
