Every cock has a kidney. Chicken kidneys are chicken testicles. Generally speaking, kidney refers to kidney, but it has nothing to do with chicken kidney. It refers to chicken testicles, which are egg-shaped, slightly smaller than pigeon eggs, milky white in color and tender in quality. They are wrapped in fascia, and their main function is to secrete hormones, which is related to reproductive functions. Eating them has the function of tonifying kidney and keeping fit, and they are often used for stewing soup and barbecue.