Regents of the University of Michigan
Animal Diversity Web: Introduction to Teeth
The Animal Diversity Web offers a very good description of teeth in the digestive process of mammals. Covers the variety of teeth and links to discussions on a variety of teeth issues.
University of California
Ucmp: Eutheria
UC Berkeley offers a very general description of the generalized diet of mammals. This means it describes the fact that there is an enormous variety of diets.
Earth Life
Earth Life: Mammals: Diet and Digestion
This site discusses the diet and digestion in all sorts of mammals, including herbivores, omnivores, and carnivores. Read about different kinds of animals and their different dietary preferences.