Ankylosaurus
The ankylosaur or fused lizard is the stegosaur's distant cousin. Despite not having any spikes, it is among the most armoured animals of all time. It has a tough club at the end of its tail, which can easily tear down walls.
Coverage
In Walking with Dinosaurs − The Arena Spectacular, an ankylosaur teams up with a wandering Torosaurus to intimidate a baby Tyrannosaurus rex before mama rex enters the arena.