The term 'extinct mammal' refers to animals that are no longer living on Earth. Two examples of extinct mammals are the MAMMOTH and the mastodon. The MAMMOTH was a large, hairy elephant-like creature that lived in the northern hemisphere during the Pleistocene epoch. The mastodon was a large, elephant-like mammal that lived in North America and Eurasia during the Pleistocene epoch. Both the MAMMOTH and the mastodon went extinct around 10, 000 years ago.