Humans have killed off most of Earth's big mammals. In 200 years, cows could be biggest ones left.
Throughout history, humans and their ancestors have perfected the art of killing big animals. Now, a new study finds that as humans spread around the globe, extinction of large mammals soon followed.
Massive mammals such as wooly mammoths, elephant-sized ground sloths and various saber-toothed cats roamed the Earth between 2.6 million and 12,000 years ago. Now they — and most of the rest of the big ones — are extinct.
More Story
https://www.usatoday.com/story/news/201 ... 533199002/