Farmer Discovers Four Giant 'Ancient Armadillo' Glyptodont Shells In Dried-Out Riverbed

Another shell belonging to one of the long-extinct mammals was discovered in Argentina in October last year, as well as yet another four years ago.

Despite those recent discoveries, these shells remarkably rare. Near complete shells - or carapaces as they're known - are not found very often.

So, what exactly were Glyptodonts?