It is said that after a northerner went to work in the south, he couldn't find the chicken gizzard in the supermarket, but found the chicken gizzard in the package labeled "chicken kidney", which made him deeply doubt his cognition for decades: Is the chicken gizzard I know actually a chicken kidney? In fact, it's just a different name.
Due to the language evolution, southerners usually call chicken gizzards chicken kidneys, which leads people to confuse chicken gizzards and chicken kidneys at some times, but in fact, chicken gizzards and chicken kidneys are completely different things. Chicken gizzard refers to the gizzard of chicken, which is also called muscle stomach.
Simply put, it is the chicken's stomach, which is responsible for storing and grinding food. It is very rich in nutrients, flat and round, with fascia outside, skin inside and meat on both sides. Chicken kidney is an organ of chicken, belonging to the urinary system, which is responsible for filtering impurities in chicken blood and maintaining the balance between body fluids and electrolytes. It is shaped like chestnut and colored like pig liver. Although chicken kidney is delicious, it has almost no nutrition.