How did the altirhinus protect itself from its enemies?

What are some poisonous plants that existed in the cretaceous period? What do scientist compare dinosaur fossil to when they classify them? Were dinosaurs cold blooded? What are the three most important factors of where humans decided to live one thousand years ago? Where Paleolithic people alive when dinosaurs where around? Can you tame the Wild Dragons from the Dragon Cave? What were the creatures in the Doctor Who episode Father's Day of season one? How do frost dragons breathe frost? Where was triceratops fossil found in Alberta? How did apatosaurus become extinct? How much water did a dinosaur use in a day? What ethinic origin is Dino Dappy Contostavlos? What kind of scientist studies dinosaurs and ancient life? Does sprite effect teeth? How do you use dynamite on evony? What do you call a dinosaurs that eats plants and meat? How tall is a Troodon? Which came first dinosaurs or Madonna? What is the difference about trex and stegosaurs? What is the common ancestor of pterosaurs and crocodilians?