Megafauna are species of large animals (Greek μεγας, large, + modern Latin fauna, animal). Definitions of what constitutes 'large' vary, with some authors using a 40 kg minimum, others 44 kg, 45 kg, 100 kg, or 250 kg. In the last case, they may be further subdivided into small (250–500 kg), medium (500–1,000 kg) and large (over 1,000 kg) megafauna. The term is also used to refer to particular groups of large animals, both to extant species and,… (More on Megafauna)