The primary energy source for most animals is carbohydrates. Carbohydrates, primarily found in foods like grains, fruits, and vegetables, are metabolized by animals to produce glucose, which serves as a readily available source of energy. This energy fuels essential bodily functions, including muscle activity, organ function, and cellular processes. In addition to carbohydrates, some animals also utilize fats and proteins as energy sources, especially in situations where carbohydrates are scarce. The efficient use of these energy sources is vital for maintaining health and supporting growth, reproduction, and overall vitality in the animal kingdom.