Ankylosaurus

The armored dinosaur with a built-in wrecking ball/Dinosaurs & Extinct Animals

Ankylosaurus was a living tank — a heavily armored herbivore covered in bony plates called osteoderms embedded in its skin. Its signature feature was a massive bony club at the end of its tail, which it could swing with enough force to break a predator's leg. Living in the Late Cretaceous about 68 to 66 million years ago, it shared its habitat with T. rex, which may explain why it evolved such ridiculous levels of armor. Ankylosaurus essentially said "hit me" and meant it.