Glycogen

• Glycogen is the main energy storage material in animals.
• Animal cells get energy from glucose too. But animals store excess glucose as glycogen - another polysaccharide of alpha-glucose.
• Its structure is very similar to amylopectin, except that it has loads more side branches coming off it. Loads of branches means that stored glucose can be released quickly, which is important for energy release in animals.
• Its also a very compact molecule, so its good for storage.