A mature male goose is called what?

A mature male goose is referred to as a gander. This term is specifically used to distinguish male geese from their female counterparts, known as geese. Understanding these terms is important in the context of avian terminology, particularly in relation to waterfowl.

Other terms provided in the choices refer to different species or classifications: a drake is the term for a mature male duck, a stag is typically associated with a male deer, and a cob is a term used for a male swan. Recognizing these definitions helps clarify the distinct terms used for different birds, emphasizing the importance of using the correct terminology in discussions about avian species.