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Orn is the second book in the Of Man and Manta trilogy by Piers Anthony. Veg, Aquillon, Cal, and the mantas are sent on an expedition to a world that is very similar to Paleocene Earth.

Overall, I enjoyed this book. Anthony gives great descriptions of Paleo Earth complete with flora and fauna. The characters encounter an isolated enclave where a population of dinosaurs have survived through the Cretaceous. Some of the dinosaurs are described in depth, which I found quite interesting.

On the way the expedition group meets up with a bird they call Orn. Orn, himself, is a main character in the book and adds an intriguing dimension to the story. The characters also have to grapple with tough moral dilemmas that I think makes for a stronger story.

While Anthony's science is a bit outdated in a few areas, I would still consider this an excellent hard science fiction novel set in pre-historic times.