than natural history... but draws accurately on the latest discoveries in paleontology." A team of scientific and technical consultants contributed to the film. One team member was Dr. Steve Brusatte of the University of Edinburgh, who is a Chancellor's Fellow in Vertebrate Palaeontology. Brusatte said the filmmakers strove to understand the discoveries about dinosaurs since the release of Jurassic Park in 1993, "They used so much of this information that we've learned over the past few decades, about feathered dinosaurs, about how dinosaurs lived in big herds, which dinosaurs preyed on each other, their environments, and used that to tell the story." Some dinosaurs in the film are feathered. Brusatte said, "Over the past 15 years, we have collected thousands of specimens of feathered dinosaurs – proper bona fide dinosaurs covered in feathers." New Scientist reported that "no evidence has yet been found" to suggest that the Pachyrhinosaurus or the Gorgosaurus were feathered. Director Cook said of the Gorgosaurus, "We decided that we wouldn't put feathers on that one, but we did give that dinosaur iridescent scales." National Geographic said, "Many paleontologists and dinosaur fans are disappointed that CGI docudrama's villains, a gaggle of iridescent Gorgosaurus, are devoid of any fluff or fuzz." Shortly after the filmmakers designed their Gorgosaurus for the film, the tyrannosauroid Yutyrannus was discovered with direct evidence of feathers. While older than Gorgosaurus, Yutyrannus provides further evidence of feathers in tyrannosauroids. National Geographic also noted that Gorgosaurus was depicted as feathered in the 2011 direct-to-video film March of the Dinosaurs. Palaeontologist Anthony Fiorillo was a consultant for the film and helped determine what dinosaurs lived in Alaska at the time. Fiorillo said "the first known track" of a therizinosaur in Alaska was discovered in 2012, which was too late to include in the film's lineup of dinosaurs. The palaeontologist said based on ongoing research of the Pachyrhinosaurus perotorum, which he discovered in Alaska in 2012, he would have modified his advice to the filmmakers about designing the film's Pachyrhinosaurus. Don Lessem, a writer who specializes in dinosaurs, said Walking with Dinosaurs was an improvement from Jurassic Park in how the dinosaurs fit the period. He found most of the dinosaurs to be depicted correctly but also highlighted the possibility of the Gorgosaurus having feathers. Lessem stated the Alaskan scenery, while "a spectacular backdrop", did not exist at the time, "Conifers excepted, such scenery did not exist