Hmmm. The science content is paleontology 101 (though the explanation of the factors that impacted the changes from one earth age to the next is quite accessible). Only wiith regard to a few major species and subspecies do we get some sort of discussion of their basic attributes, strengths and weaknesses, however -- other creatures falling into the same bracket are basically name-dropped in as a lengthy list, without any discussion whatsoever. Perhaps most importantly, though, this is another huge case of titular mislabelling -- this is about the author's own career, field trips, cooperation with other scientists, and about his personal heroes as well as the notable scientists of yesteryear, at least as much as it is about the dinosaurs themselves. I'll finish it, but it's not anywhere near a five-star book.