Definitions for "Megafauna"
Animals weighing more than 100 pounds when alive. The Mammoth, Mastodon, Giant sloth, and Short-faced cave bear would have been megafauna.
all animals weighing more than 100 pounds
The large animals (mammals and flightless birds) that existed in the Quaternary and, in many cases, became extinct at the end of the last ice age (about 10,000 years ago).