Your cats are predators that have evolved to eat and thrive on a diet of raw meat. The structure of their jaws, teeth and digestive system have not changed since the days that they would hunt and scavenge for their food. Therefore, it makes perfect sense to feed them a diet of raw meat and bone, just as nature intended. This makes them Obligate Carnivores. They require meat and meat only for all their dietary needs. Therefore a 100% raw diet offers them all their dietary requirements. A complete raw diet should consist of a balanced ratio of meat, bone, and offal. Taurine is an essential nutrient that cats have a limited ability to produce and must ingest to be healthy. Taurine is found in all raw meats, but the best sources are found in chicken hearts and liver.