When we eat meat

According to the United States Department of Agriculture (USDA), all meats obtained from mammals (regardless of cut or age) are red meats because they contain more myoglobin than fish or white meat (but not necessarily dark meat) from chicken.Under the culinary definition, the meat from adult or "gamey" mammals (for example, beef, horse meat, mutton, venison, boar, hare) is red meat, while that from young mammals (rabbit, veal, lamb) is white. Most poultry is white, but duck and goose are red. Most cuts of pork are red, others are white.source:wikipedia