Ankylosaurus was a 4-ton herbivore that lived about 65 million years ago at the end of the Cretaceous Period. Representing the pinnacle of evolution in dinosaur defense, Ankylosaurus was a veritable tank. These wide and low dinos were covered with armor plates which were used together to form a nearly impenatrable shell. They featured triangular horns on their heads and a large, club-like tail. Their leathery skin was covered with spikes, which even covered their eyelids.
What does the Ankylosaurus have to do with modern security? There's probably some lessons we can learn from them. Their skulls were so thick that some scientists think that their brains were no larger than a golf ball, and as such, they were one of the least intelligent dinosaurs. Further, the fusion of the bones in their backs and necks helped prevent attack, but they probably couldn't even lift their heads to reach food above ground level. And despite their formidable defenses, none of them survived past the K–T extinction event.