Britannica Educational Publishing 
Grazers [PDF ebook] 

While they come in all shapes, textures, and sizes, animals that subsist on the Earth’s natural vegetation share many common elements as well. Occupying a unique place in the food chain, grazers all over the Earth provide vital nourishment for carnivores and are often valuable to humans for meat, skins, and various domestic uses. This volume provides a colorful view of these varied and complex creatures as well as the features and behaviors that both bind them together and set them apart.