The storage form of carbohydrates in animals is called glycogen. It's a multibranched polysaccharide. The quick-energy form of carbohydrate found is animals is glucose. Glucose is a simple monosaccharide with the formula C6H12O6.
The only three atoms found in carbohydrates are Carbon (C), Oxygen (O), and Hydrogen (H). They are named carbohydrates after these three elements, carbo from carbon and hydrate from water, which is H2O.