First off, all of the animals you listed are alive today and none of them weigh 10 tons. To this day we still don't have a complete fossil of a dinosaur, just small skeletal parts here and there. Go to any museum that displays a dinosaur skeleton or pieces of one and they will admit they are all plastic replicas or grafted from various animals bones. Dinosaurs were drilled into our heads as children so we would accept the doomsday scenario of mass extinction being a possibility. Your assuming that we have a legitimate full skeletal structure, the creatures are nothing more than a form of art. Not to mention ALL the so called dino bones were found when paleontologists where specifically searching for them. The word dinosaur comes from the root word terrible lizard and was invented in 1842. Yes, really, the word dinosaur means terrible lizard. Research the bone wars and come to your own conclusions.