The biggest issue with this book is that everything from its title to its illustrations and even much of its Goodreads synopsis advertises it as a standard book on dinosaurs, when it is, more accurately, a work of speculative biology. As such, it is a sad reality that many speculative biology fans will not be exposed to book as great and as fun as this.
The author lays it out plainly in the introduction - this is a work of fiction. Real dinosaurs known from fossils are given entirely speculative colours, behaviours and symbiotic relationships, done so with both a nod to real-world biology and a lot of humour, with such beautiful concepts as Oviraptor serving as pest control for Protoceratops nests (a nice palaeontological in-joke), Compsognathus being reported as stealing certain possessions of time-travelers (including, on one occasion, an unexploded stun grenade), and Masiakasaurus having a mating call like 'an electric guitar screaming in pain'. I'd recommend this to fans of All Yesterdays, with a similar concept, although notably this book lacks the distinctive and eye-catching artwork of All Yesterdays. The artwork of this book, by Luis Rey, is undeniably beautiful, but doesn't contain any of the aforementioned speculative elements. All of that is simply present in the text.
Nevertheless, I highly recommend this book, a deeply underrated work in a deeply underrated genre.