This document outlines the extinction of various species throughout history from 2500 BC to 2013. Many species became extinct due to human activities like overhunting for food or leisure, or habitat destruction, including dinosaurs 65 million years ago, saber-toothed cats and mammoths due to climate change, the dodo bird in the 1600s from hunting and habitat changes, and more recent extinctions of tigers, seals, deer and others from 1900-2013 primarily from overhunting.