In response to number 6, you are very welcome!
I'll have to agree with Post #3. The Zoology Coloring Book is by far the best book on animals I've ever seen. The book makes the study of animals fresh and entertaining for the most bored of students. From cover to cover it is jam-packed with information, pictures, and charts, providing an amazing sensory adventure. This book is a must-read for children, teens, and adults alike.
This book is mostly an informative volume you'd find at home, but did you know this book has even been used by zoology teachers in the classroom? So either at home or at school, it's a winner!
This answer is a little tangential to your question, but I would like to recommend the best book on biology I have ever read--perhaps the best book on any subject I have ever read. That is Richard Dawkins's The Selfish Gene. He is a world-famous biologist who works at Oxford. He has written a number of other books on the subject, mostly dealing with aspects of Darwinian evolution. I should think Darwin's own great book would be one of your priorities, if you haven't already read it.
The Zoology Coloring Book, by Lawrence M. Elson, is one I have used for years with my students. It has detailed illustrations that my students can color on the high school or college level, and it has very detailed information about all the organs inside all the animals and how their body systems work. You can get it on Amazon or at any Book Store and I highly recommend it. My edition that I use is from 1982 ISBN-10: 0064603016 | ISBN-13: 978-0064603010 | Edition: 1. I also recommend Grzimek's Animal Life Encyclopedia, and by the same author, the Encyclopedia of Mammals. I use Prentice Hall Biology which has excellent comparisons of invertebrates through vertebrates and covers all the Phyla of animals in excellent detail. Having taught Zoology for years, I have to say other excellent sources are various websites especially National Geographic, Discovery and other science based sites. Good luck.