This book is one that could be considered a good starter volume for anyone who is interestd in the emotional lives of birds and animals, especially as, only a few decades ago, any scientist who maintained that any creature apart from man had emotions, was accused of anthropomorphization creatures that were considered little more than instinct-driven automatons.
Unfortunately, the authors of this book have made some serious errors in the course of their analyses, which should be corrected in a later edition.
On page 128 the author states that organic antifreeze in a frog's cells keep the cells from dehydrating in winter. In reality, this antifreeze keeps ice crystals from forming as these crystals would damage the cells, leading to the animal's death.
On Page 202, there is a statement to the effect that pterosaurs swallowed volcanic rocks or pebbles and used them to spit fire. Neither my scientist friends nor I have ever heard of any such results being published in any scientific papers - such a discovery would be front-page news - so either this statement was meant as a joke, or it is an expression of wishful thinking that dragons could have existed at some time.
Page 228 - Genes do NOT change within a generation - that idea, as once expressed by Lamarck, has long since been discredited. It can happen, though, that genetic variation in a population leads to different genes finding expression under different circumstances, a phenomenon known as genotypic plasticity. Darwin's finches do not "change their beaks." Those that have beaks even marginally better suited to handling the food that is available at a given time will be more successful in raising young, thus handing down their form of beak, which will slowly evolve into the form ideal under the prevailing circumstances... until circumstances shift again, leading to a new round of developments.
These are the main details that should be corrected at some point. Otherwise, the book is a good and entertaining read which anyone, from the beginner to the scientist is sure to enjoy.