Chicken tip or duck tip: also known as "chicken butt" and "chicken butt tip". Refers to the long tail and feathers on the upper hips of birds such as chickens, ducks and geese. The meat is tender and tender, and the scientific name is "bursa on the cavity". This part is the place where lymph glands are concentrated, because macrophages in lymph glands can swallow germs and viruses, and even carcinogens can be swallowed, but they can't be decomposed, so they will all precipitate in the buttocks. The buttock tip is a warehouse that hides evil people and practices evil people.