Britannica Educational Publishing 
Closer Look at the Animal Kingdom [PDF ebook] 

Distinguished by their highly developed mental faculties and their capacity for reason, humans are often said to reign sovereign in the animal kingdom. With their complex interactions, intricate social structures, and extensive range of displayed emotions, however, all creatures can be said to contribute uniquely to the planet and to the subsistence of all other beings. This colorful volume surveys the various members of the animal kingdom and the habits, behaviors, and physical characteristics that unite and distinguish all animals.