"The Ankylosaurus hits all your prime targets. Your mainstream visitor will recognize the name, which makes them happy they visited the park. It's the best four-star dinosaur choice. Place an Ankylosaurus in a pen with another late Cretaceous dinosaur like an Albertosaurus to excite dino nerds. For maximum impact, stick an Ankylosaurus with a late Cretaceous herbivore like a Corythosaurus to impress both dino nerds and fun lovers, who want to see herbivores frolicking together. Thrill seekers want violent conflict. The problem is, dinosaurs keep dying, and that costs you time, effort, and money.

The answer: the armored Ankylosaurus. Carnivores will keep attacking the Ankylosaurus, so your spectators get a good show. Rarely will an ankylo drop, so you don't have to worry about restocking the pen unless an Ankylosaurus' tail performs an execution instead of inflicting a warning shot."

~Prima's Official Strategy Guide