1, Appearance and size: Small kidney refers to pig adrenal gland, also called pig kidney flower, which is small in shape, triangular, dark in color and tender in texture. Big kidney refers to pig kidney, also called pig kidney, which is large in size, long in shape, light in color and relatively hard in texture.

2. Location: The big kidney is located behind the waist of the pig, and the small kidney is located in front of the waist.