megafauna

Zoology. large or giant animals, especially of a given area. Because megafauna tend to have long lives and slow population growth and recovery rates, many such species, as elephants and whales, are particularly vulnerable to overexploitation by humans.

Ecology. animals of a given area that can be seen with the unaided eye.

Classical Mythology. large or giant mythical creatures, often resembling a familiar animal, as a hellhound, or a composite of different animals, as a griffin.