1. Cow: Cow is the main source of milk and milk products like curd, butter, ghee and cheese. Its meat is eaten as beef or steak, called as red meat rich in protein.
2. Hen: Hen is the most important source of egg, which is rich in fat (yolk) and protein (albumin). It is the most commonly eaten non-vegetarian food.
3. Bees: Bees produce honey from plant nectar. This is used as a sweetening agent. It is used to treat cough, burns etc.
4. Goat: Goat meat is eaten as mutton, and is a rich source of protein.