A fungus (plural: fungi) is a kind of living organism that includes yeasts, moulds, mushrooms and others. Fungi have thin thread-like cells called "hyphae" that absorb nutrients and hold the fungus in place. Some, such as mushrooms, also have a body containing many cells. Fungi do not have chlorophyll to capture energy from sunlight as plants do. Instead, they are nourished by digesting dead organic matter around them and absorbing it. The study of fungi is called "mycology".