Dinosaurs - an almost impossible concept to consider. More than 65 million years ago, reptiles as tall as a skyscraper walked the earth? Predators the size of a school bus terrorised the planet? Its all true. And these gigantic beasts have inspired and fascinated us for at least 200 years, if not for centuries before that. Perhaps the first dinosaur that any youngster learns about (besides the King, Tyrannosaurus Rex) Brontosaurus was a huge four-legged reptile with a whip-like tail and a long neck used for reaching the youngest, greenest shots at the tops of the prehistoric treeline. Appearing here, in full colour, Brontosaurus is limited to a mintage of just 2,000.