Eggs and dairy products are important sources of protein, calcium and other nutrients. Eggs are laid by many animal species and those from chickens are most commonly consumed by humans. They are high in protein and can be used in both savory and sweet dishes. Dairy comes from milk produced by many animals but primarily cows. Milk and other dairy products such as butter, cheese and yogurt are consumed worldwide and are versatile ingredients in many recipes. While dairy is a good source of calcium and protein, some argue that plant sources provide these nutrients as well without potential downsides of dairy consumption.