Louise Spilsbury 
What Are Food Chains & Food Webs? [PDF ebook] 

This book explains the transfer of energy between living things-known as the food chain-in a way that allows any reader to grasp the scientific principles behind food chains and food webs. The diets of herbivores, carnivores, and omnivores are explained, as well as other types of diets, and the flow of energy between these groups is made clear with arrowed diagrams and colorful pictures that show where different species derive their energy. Also examined are the effects different habitats have on the food chain, and how food chains in different environmental regions can be contrasted.