If you look back at the dinosaur skeleton on the previous screen, you will see how it is made up. The most striking thing is that it is made up of a very large number of bones. However, some bones are bigger than others.

Let's start with the head. Can you find the head? In fact, you might have to spend a little time looking for it. It should be at the end somewhere and indeed it is, but in this case it is upside down. Dinosaurs are vertebrates, that is they have backbones, and backbones are made of many similarly-sized short rods called vertebrae. The vertebrae lead from the head down through the neck.

Below the neck is the rib cage, the part of the skeleton that holds the lungs, stomach, heart and many other soft, flopping organs. They are all protected and held together and stopped from flopping around by this bony cage and some muscles. Our ribs are long and thin, and so are they in dinosaurs. You should be able to see them by following the head past the neck to where the bones become long. .

Below the rib cage there is a massive bone. If you think of our bodies, we have a massive bone in this position, too. It is the bone which is a giant socket for the vertebrae and also the legs. This bone is called the pelvis, and commonly known as the hips. Have a feel around your waist and find your own pelvis. Because it does the job of carrying so much weight (from head, neck and upper body, it has to be made in a very heavyweight fashion. The dinosaur pelvis is no exception. You can work out which bone is the pelvis by seeing where the big leg bones meet the rest of the body.

We don't have much of a tail (we do have a bit of one, but it is now inside out bodies). We don't need it. But this dinosaur clearly has an enormous tail, again made of lots of vertebrae. Why don't we need a tail? Because we stand upright. Dinosaurs have tails to balance the weight of their neck and head. So what does this tell us? That dinosaurs moved about with head down and tail up, balanced about the pelvis (the hips). They must have been like giant seesaws. So, by thinking about the skeleton we are already starting to think about how the dinosaurs stood. There is much more we can guess from the bones, and thinking about what they were for and how they worked, as you will find out as we continue out studies.