In gastronomy, red meat is commonly red when raw and a dark color after it is cooked, in contrast to white meat, which is pale in color before and after cooking. In culinary terms, only flesh from mammals or fowl (not fish) is classified as red or white.In nutritional science, on the other hand, red meat is defined as any meat that has more of the protein myoglobin than "white meat", defined as non-dark meat from chicken (excluding the leg or thigh) or fish.source:wikipedia
Some meat, such as pork, is classified as red meat under the nutritional definition, and white meat under the common or gastronomic definition.