MAURICIO ANTON / SCIENCE PHOTO LIBRARY MAURICIO ANTON / SCIENCE PHOTO LIBRARY
Ancient bison (Bison antiquus), artwork. These bison lived from 18,000 to 10,000 years ago. They were taller than modern day bison and had larger horns which could measure up to three feet long. It is believed that the ancient bison became extinct through hunting by paleo-Indians.
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