英语听力：恐龙是怎样炼成的—15

But even working out exactly what an adult T-rex would have looked like only gives you a snapshot of a moment in time. To really understand this animal, we need to know how it changed over the course of its entire life. And that's why Luis's team are attempting the first ever reconstruction of a baby T-rex.

-There are some small, very tiny segments of the baby. But some of them are so small that we can't match anything up. Nothing like this has ever been found before.

It's much harder to recreate a baby than an adult. Only a few tiny fragments of a skeleton have ever been found. Paul's colleague Tommy is trying to piece together the remains from a little more than dinosaur dust.

-There’s not a lot of pieces and it’s only for the skull. See, I mean I've got several little pieces put together. Its bones had similar colour. Their texture on the surface was pretty close. And a lot of times I would look at the edge of the bone. You see, this one has a little white and a little black. A lot of times I was just trying to piece to see if they’d fit. A lot of people find it boring. But I don’t know. It calms me.

Although useful for scientists, these fossil remains are far too limited to bring a baby T-rex to life for an audience. And that's why the entire baby skeleton will be a model, its bones made not from fossils, but from foam and resin. This is where the artists come in. They will produce creatures from their imaginations but they have to be guided by the science which provides them with a range of possibilities. Ultimately the animal that they draw or sculpt will be a blend of science and art. The baby T-rex will be sculpted by Doil, one of Louis's artists.

-When you’re doing something that's brand new that there is no precedent for, it can be a little nerve-racking and it can be a lot fun. For my baby T-rex, there is no reference for that. So there’s a lot of interpretation there. With his…