In this book Montroll not only makes some of the best animal models so far but also creates systems of folding 4-leg animals and 6-leg insects. The folding steps in each model are very natural, with great logic and wits. Montroll is so scintillating in these designs that he creates 2 outstanding origami bases, Montroll's Dog base and Montroll's Insect base. In application of these 2 bases many vivid animals (REALLY VIVID!) are folded and exhibited. Other animals are well-designed too, including a cock, a penguin from the front side, etc. In my opinion, this is the finest among Montroll's origami books.
I disagree with reviewers stating that this is the best Montroll book.
The two "Enthusiasts" books are still the best Montroll in my opinion, containing his best models and with color photographs. If you don't have those, get either in preference to this book. If you have both "Enthusiasts" this is a resonable third Montroll.
What we want from Montroll is a collected works, rather than multiple losely themsed assortment books, but his designs are often delightful.
Sufficiently technical to be both challenging and rewarding, but still realisable with medium sized sheets of standard origami paper folded more or less on the move (rather than requiring large sheets, tweesers, and intense concentration) Montroll is is excellent resource for intermediary and advanced folders.
This book is notable for containing Montroll's new (in 1990) Dog and Insect Bases, but the biaxial Dog base legs are a little too short for truly convincing canines, and the base only really works when the back is exploited - as with the Bison and or Camel - rather than sunk away as with the dogs. The insect base is more interesting, but the book contains only two models based on it.
Apart from the white-tusked Elephant and Walrus , there are just four two-coloured models in this book: A Penguin and Panda, both of which have white rather than black inner front legs (wings) which looks naff, a Peacock, and a Rooster. The Camel ( and Dromedary) are two colour in the sense of having white head and necks, but this doesn't really work aesthetically in my view. You have to fold these from same-sided paper.
As with all Montroll books, the origami is just one sheet (square apart from the rectangular (dollar-bill) Walrus) with no glue or cuts.
This, in my opinion, is Montroll's best book out there. The small details of the models are superb, especially the panda bear and the camel. Most of the animals stand up by themselves and make great displays.