This book describes in great detail the differences between reptiles, birds and amphibians; considering brain structure, bone and skin formation. He argues that

For use in schools and libraries only. A Step Into Reading Level 4 book about flying dinosaurs--some so small they could perch on your finger and others so big

Reproduction of the original: Dragons of the Air by H. G. Seeley

The thrilling conclusion to the adventures of the four elemental dragons and their human guides, the fourth and final book of the history-spanning Dragon Quarte