the animators. The computer effects for the first episode took around a year to make, though the process could be significantly sped up afterwards; the five other episodes together took only six months. Initially, Framestore produced 24 different computer-generated animals, but as the concept of the series grew they had made 40 different species by the end of production. Compositing (adding the CGI together with the live footage) was done using five Quantel Henrys and five Discreet Logic Infernos. Animatronics Though most of the animal shots in Walking with Dinosaurs are CGI, the series also made extensive use of animatronics and puppets. Haines explained in behind-the-scenes material that animatronics, despite advances in CGI, still played an important role, particularly in close-up shots; "The computer can fool the eye making a dinosaur run through a puddle and splashing but if you want a close-up of him dipping his nose into water and moving it back and forth, a computer-generated nose wouldn't look right." The animatronics and puppets of Walking with Dinosaurs were made by the special effects company Crawley Creatures. Over 80 animatronic models were made for the series, mostly for close-ups of heads or other body parts. In some cases full body versions were made, mostly for corpses but also for some animals, such as Ophthalmosaurus. The greatest challenge for the artist at Crawley Creatures was working against time, since they only had six weeks between location shoots to put together animatronics and puppets for the next episode. The most challenging animal to model was the large pterosaur Ornithocheirus, which had to be able to work in different positions for the purposes of the series and had to be extremely light-weight for purposes of transportation. After filming, several of the models used in Walking with Dinosaurs, including those of Ophthalmosaurus, Ornithocheirus and Koolasuchus, were given to David Martill and then used by him for educational purposes at the University of Portsmouth. The Ophthalmosaurus model, having been dragged through water, had to be repaired and repainted and is today displayed for the public; the Ornithocheirus and Koolasuchus models were later sold. Numerous models also made their way to the Oxford University Museum of Natural History due to an association between Crawley Creatures and the museum. Music Ben Bartlett composed the score for Walking with Dinosaurs. Bartlett was then working with the BBC, having produced some station ident themes for BBC Radio