Many critical reviews of the work came from scientists who objected to Bakker's dramatic license and departure from established facts. The paleontologist Thomas Holtz noted that Bakker combined fauna in ways not directly supported by the fossil record; for example, several of the dinosaurs featured in the books lived millions of years after "Utahraptor" died out. Michael Taylor, curator of vertebrate paleontology at the National Museums of Scotland, panned the book, saying that ""Raptor Red" is an accurate portrayal only within the context of uncertainties over the reconstruction of fossil animals as living forms ... Bakker's postscript never really admits these uncertainties." David B. Norman criticized the book as "no more than a children's adventure story—and a rather poorly written one at that ... The merging of science and fantasy is at its worst in books like "Raptor Red" because none but the experts can disentangle fact from fiction; this type of nonsense turns an uninformed reader into a misinformed one." Jay Ingram, from the Discovery Channel, published a rebuttal, saying, "The most important point is that Bakker's portrayal of the dinosaurs in "Raptor Red" is vivid—vivid in a way few museum displays or factual accounts can be. And if it turns out in the long run that some of the speculation is unwarranted, who cares? Bob Bakker has given us a unique window onto the era of dinosaurs."