 The book depicts an Earth-like world on a moon which orbits a gas giant, inhabited by a species of highly evolved, sentient Tyrannosaurs called Quintaglios, among various other creatures from the late cretaceous period, imported to this moon by aliens 65 million years prior to the story.Originally published in 1993 by Ace Science Fiction, it won the Homer award for "Best Novel" during its initial release date.It was reissued in 2005 by Tor Books.