From June 24, you will have a rare and exciting opportunity to explore the prehistoric world of dinosaurs. The Beijing Museum of Natural History and the Sichuan Zigong Dinosaur Museum have loaned eight dinosaur fossils to Hong Kong and they will go on display next week at Cityplaza in Taikoo Shing. The exhibits, which also include 10 other plant and animal specimens, are national treasures that have never left the mainland. Dinosaurs are reptiles that evolved 230 million years ago during the Mesozoic era, also known as 'the age of reptiles'. The word 'dinosaur' derives from Greek and means 'terrible lizard'. After ruling the earth for millions of years, it is widely believed that climate change caused the extinction of these creatures 65 million years ago. Everything we know about dinosaurs comes from studying fossilised bones and footprints, and paleontologists have so far classified more than 700 different types. The better known ones include the tyrannosaurs and the triceratops. Tyrannosaurs roamed the earth around 67 million years ago. The largest of the theropod ('lizard-hipped') carnivorous dinosaurs, they weighed four tonnes and were 14 metres long and five metres tall. The two-legged predator had a powerful tail, large head and small arms, and used its mouth and sharp teeth to attack its prey. The four-legged Triceratops stood 2.9 metres tall and 7.6 metres long, and weighed 5,000 kg. Triceratops were herbivores who used their horns to gather food. Fossil remains show that they also used them to fight off enemies. Not all dinosaurs lived on land. Some such as plesiosaurs lived in the water, while others such as pterosaurs could fly even though they weighed as much as 20kg. To learn more about dinosaurs, don't miss the Cityplaza exhibition which runs from June 24 to July 31. Fifty dinosaur skeleton sets are being given away. Go to www.yp.scmp.com and tell us why you love dinosaurs in 20 words or less. Don't forget to include your name, address and telephone number. The best 50 answers will receive a set. The deadline is July 15.