Putting a dinosaur skeleton together is not easy. The skeletons are usually very incomplete. Many dinosaur fossils are discovered badly damaged. Bones are often found crushed (压碎) or bent by the great weight of the dirt and rock above. Sometimes parts from different creatures are mixed together. This just adds to the confusion.
Unfortunately, some scientists have not been careful enough in their descriptions of dinosaurs. They have told grand stories of how dinosaurs looked and behaved. All of these descriptions are based on guesswork — the imaginations of people who have never seen a living dinosaur. Some scientists have made complete pictures of dinosaurs based on just a single bone or tooth or leg. Such pictures are based on many guesses and very little facts. The scientists’ ideas often turn out to be wrong when more facts are discovered.
Dinosaur fossils are not found with labels attached showing what the animals looked like. That is why no pictures of dinosaurs are exactly right. Every dinosaur painting is sure to contain at least some wrong information. No artist in the twentieth century ever saw the living, breathing animals — complete with skin, flesh, and color.
For instance, imagine never having seen or heard of a peacock. One day you find the jumbled bones of it buried in the ground. You try to put the bones together to form a skeleton. And then you try to draw a picture of what the animal looked like when it was alive. But bones cannot tell the whole story. Even if you are a very good artist, it would be a miracle if you drew a true picture of a peacock just from the bones and your imagination.