Chicken giblets include the heart, liver, and gizzard of the chicken. Every wild carnivore on earth consumes the heart, liver, and viscera of their prey. In fact, when observing wild canines and felines consuming their kills, one may notice that these particular parts of the prey animal and other organs (not the muscle meat) are the most sought after. These organs contain many key nutrients not present in muscle meat. Based on the fact wild carnivores have been consuming the heart, liver, and gizzard of prey animals for eons with great benefit, Wysong contends that these are indeed "quality ingredients."