Imagine a 40-foot long duckbilled creature weighing 7 tonnes and with 2000 teeth. I`m talking about a dinosaur of course, namely the hadrosaur. Despite these impressive credentials he was content to eat only coniferous leaves and soft plants. Now that`s what I call a gentle giant. A long long time ago he frequented the (now grassy but then swampy) plains a hundred or so kilometres north-east of Calgary. His fossilised bones, and those of many other dinosaurs that preyed on him, have been reassembled in painstaking detail at the Royal Tyrell Museum of Paleontology, close to where these photographs were taken.