Family of ankilosauridae (which are protected under bony armor, armored lizard literally), we can point the Gastonia burgei. A herbivorous whose most notable physical feature was its enormous armor protecting the back of the body and neck and serves as an indication to know your storyline. An armature, a row of spines and bumps that made it impossible to sink your teeth predators. Besides working in packs, and facing a predator joined rows forming impassable reminds African buffalo versus lions.
The characteristics of the excavation where the fossilized bones were found, no one knows exactly the number of spines possessed. Is known is that some reach 50 cm (1,7 ft) in length, therefore, predators should be very careful not to bump into these horns if they did not to lose an eye, or were nailed to the heart or lungs.
In fact, its only weakness was the belly, for that, the predator must rotate in order to reach an area unprotected. Something that is very difficult because the Gatonia was an animal with a very low center of gravity and weighing more than 1000 kg (2204 lb). Length up to 5 meters (7 ft) long, with a tail of 2 meters which it used as a whip and a simple swipe of the tail, was able to knock down a predator.
Found between predators to Utahraptor, which by name and intuit that was in Utah, in the United States. And the Gastonia lived mainly in what is today North America and Europe during the Cretaceous period, about 125 million years ago.
A curiosity about Gastonia. Phylogenetic by this prehistoric animal is the Ornithischia. This animal, known for their muscles, strength and be massive and heavy, shares a similar bird hip, which means bird and ornitheos ischion by hip. But this similarity does not mean anything, is only superficial because birds are from the order Saurischia