The Magpie Goose male averages 29.5 to 35 inches in length, with a wingspan of 51 to 71 inches, and a weight of about 6 pounds. Females average 27.5 to 31 inches in length, with a wingspan of 49 to 65 inches, and a weight of about 4.4 pounds. There is a protuberance on top of the head which is variable in size, but is smaller in females. The head and neck are black, as is the tail. The upper tail coverts and most of the upper wing coverts are white. Juveniles are grayer and more mottled. Feet and legs are yellow.