How do penguins produce waste?

Like other birds, penguins have a cloaca at the end of their intestinal tract where waste collects until it is convenient for them to expel it. Also birds do not expel solid waste and liquid waste separately; it is all collected and mixed in the cloaca. In the winter when Antarctic Penguins gather on land to produce and raise their chicks, they do not produce waste since they are not eating or drinking; they live by metabolizing their body fat.