Definition of "megafauna"

megafauna

noun
plural megafaunas or megafauna
1. The large animals of a given region or time, considered as a group.
  Quotations
  The extinction of the Pleistocene megafauna had ended there long before it had in Europe, and so a "broad spectrum" of food collecting had been going on for some time.
  1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 131
2. A treatise on such a group of large animals.