Eggs come from many animal species but chickens' eggs are most common for human consumption. Eggs are nutritious, high in protein, and can be used in both savory and sweet dishes. They are categorized as meat by the USDA. Ovo-vegetarians and lacto-ovo-vegetarians consume eggs. Dairy products come from milk and include items like milk, butter, cheese, yogurt, and frozen desserts. Dairy is high in protein and calcium and used widely in cooking and in many cultures from infancy through old age. Cream is produced by separating milk into cream and skim milk, and can then be further processed or used in recipes.