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.