Recently discovered in Montana by a husband and wife paleontological team, Tatankacephalus cooneyorum was a plant-eating beast built like a tank, able to take almost whatever punishment came at it and keep going.

From LiveScience:

Now called Tatankacephalus cooneyorum, the beast is a type of ankylosaur, or a group of plant-eating dinosaurs that resembled nature's armored tanks as they walked about on four limbs and their bodies were covered with bony armor that may have been covered with a colorful keratinous sheathing (same as the stuff in bird beaks and turtle shells).

"These were big dinosaur versions of a Sherman tank," Bill Parsons said. "They were armored and they withstood whatever came at them, and they just kept going." T. cooneyorum was about 15 to 20 feet (4.5 to 6 meters) in length.

And this dinosaur had its share of protection, with two sets of stubby horns, one on the cheeks and the other around its eyes, two thick domes at the back of the skull and thickened areas around the nasal region.

Bill Parsons suspects T. cooneyorum was covered with hundreds or even thousands of bony plates equipped with spikes and a tail tipped with a club, similar to other ankylosaurs. Such protection, along with a swinging clubbed tail, would have kept at bay any of the small dinosaurs around at the time, Parsons said.

To stay safe from the bigger brutes around, the ankylosaur may have flattened its body on the ground and pulled in its head, where head horns could protect the animal from a nasty neck bite, Parsons said.