Since an extensive amount of computer-generated imagery would be necessary in creating the numerous full-size dinosaurs that the project demanded, Haines initially approached Industrial Light & Magic (ILM), the company responsible for creating the visual effects in Jurassic Park. ILM projected a cost of $10,000 per every second of footage featuring a CGI shot, an estimate which BBC deemed too expensive for a television budget. Instead, Haines contracted Framestore, a local British visual effects company to create the CGI elements. Maquettes were built and then scanned, with the resulting 3D models animated in Softimage 3D and added to the live-action backgrounds. Framestore consulted several palaeontologists in assisting them with developing natural movements and appearances for the dinosaurs. Michael Benton, Thomas R. Holtz, Jr. , Peter Dodson, Peter Larson, David Martill, and James Farlow, served as consultants; their influence in the filming process was documented in the companion piece, The Making of Walking with Dinosaurs. The CG work was created over the course of two years.