Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons ...
In the past 30 years ... as well as similar-aged tracks of giant mammals. But some archaeologists say it's hard to imagine that humans would repeatedly traverse a site and leave no stone tools.
In the past 30 years ... as well as similar-aged tracks of giant mammals. But some archaeologists say it’s hard to imagine that humans would repeatedly traverse a site and leave no stone ...
(Águeda Vilhena Vialou, Denis Vialou via AP) In the past 30 years ... similar-aged tracks of giant mammals. But some archaeologists say it’s hard to imagine that humans would repeatedly ...