Toby A. Appel, Bloodletting Instruments in the National Museum of History and Technology
“ As theories supporting bloodletting grew more complex, so too did the instruments.Spontaneous forms of bleeding, including nosebleed, menstruation, and those instances produced by a blow to any part of the body, apparently inspired the earliest human bloodletters. The Egyptians claimed that the hippopotamus rubbed its leg against a sharp reed until it bled to remove excess blood from its body. [1] The Peruvians noted that a bat would take blood from the toe of a sleeping person when the opportunity presented itself. A deer, and goat, would pick a place near its diseased eye for relief. ”
