starch - found in plants. It's a polymer of glucose linked in a main chain through α 1->4 links with α 1->6 branches. Amylose is starch with no branches, while amylopectin has branches. Starch granules consist of about 20% amylose and 80% amylopectin.
glycogen - the main CHO storage in animals. Muscle and liver glycogen consists of glucose residues in α 1->4 links with lots of α 1->6 branches (many more branches than in starch).
Chime Molecular Modeling: Amylose and Amylopectin