Armadillos were traced back to about 14000 years ago, based on a fossil of a Doedicurus that was retrieved from a Argentine museum. the fossil uncovered that it was in-fact an ancestor to the common day Armadillo and not to what was once thought to be a per-historic animal called a Glyptodonts.
The shell contained enough mitochondrial cells to complete a DNA reconstruct, that close of a modern day Armadillo. unlike the modern day Armadillos who can role up in a ball for protection, the Doedicrus or old school Armadillos didn't do such thing. They heavily relied on their big size, their hard shell and their club shaped tale for protection.
This is incredibly fascinating. The ability to trace back a creature to nearly 14000 years ago is nothing shy of amazing. This could unlock even more gene decoding to find out more about the evaluation of man, and where we came from.