Homo antecessor is a type of human that lived a very long time ago. They were like our great-great-great-great-great-great-grandparents, but even older than that! They lived over 1 million years ago in a place called Europe.
Homo antecessor looked a bit like us, but they were also different. They were shorter than us, and they had big teeth and a strong jaw. They also had a bigger brain than earlier types of humans, which helped them think and solve problems better.
Homo antecessor was very good at using tools, which helped them hunt for food and survive. They made sharp objects out of stone, which they could use to cut meat and plants. They also knew how to make fire, which helped them cook food and stay warm at night.
Although we can't see Homo antecessor now as they lived so long ago, scientists have found bones and fossils that tell us about them. By studying these remains, scientists have learned a lot about our ancient relatives and how they lived.