The Zoo approached the model-making scientifically using the best materials at the time. In fact, there was a Canadian-American collaboration. Canadian Dr. Charles Sternberg, a paleontologist with the Natural Museum in Ottawa, directed the construction of the full-size models. His assistants were his associate Dr. J.M. Russell and American Dr. Barnum Brown from the American Museum of Natural History in Washington. They discussed everything about dinosaurs including the sounds they made which would later be included in the animatronic dinosaurs exhibited today at the Calgary Zoo.
The Park evolved throughout the years, was landscaped and re-landscaped. Models were added, amended and re-amended as a more educational scientific approach became part of the presentation. Much of the work in the early years was done by the assistance of volunteers but this was not recorded. There were challenges then like finding the right materials that would be durable enough to survive changing weather conditions.
In 1975, the live exhibits were in expansion mode and a choice was presented to the Zooplan Associates and the public whether to keep the Prehistoric Park or let it go to make room for more wild live animals. Surprisingly, the public pleaded to keep the Prehistoric Park.