This signed Spanish origami book written by Miguel F. Romero includes a range of models from tiny organisms and bacteria, to dinosaurs from long ago, to current living animals, to mythical creatures. 

From the author: “fu setsu shou jo kei ichi mai ori literally means "to fold a single square sheet without any cuts." These rules force the artist to solve challenges that are related to the number of appendages of the object to be represented and the efficiency of the use of paper, which put their design and execution skills to the test. Thus, this book includes exclusively origami figures in the strict sense, which represents a more interesting challenge than kirigami or modular origami.” 

Models included: 

Colibrí | Hummingbird 

Velociraptor

Therizinosaurus 

Cryolophosaurus

Ajolote | Axolotl

Tardígrado | Tardigrade (Water Bear)

Bacteriófago | Bacteriophage

Ninja 

Quetzalcóatl

Cthulhu 

Models have a brief introduction to each, as well as suggested paper size information. 

This book is written in Spanish but features diagrams for folding that do not require Spanish language knowledge.