Milk is a white liquid produced from cows. People usually drink milk as a beverage and in their cereals. Platypuses as well sweat milk. ("The Magnificent Few," "Journey to the Center of Candace," "Does This Duckbill Make Me Look Fat?"). Candace is allergic to milk and milk products. Dr. Doofenshmitrz used milk to create his stinky limburger cheese.