Koalas are sexually dimorphic as males are larger and 50% heavier than females and have broader faces, smaller ears, and a large chest gland rather than a pouch.
Koalas exhibit sexual dimorphism with the males being larger. Males are up to 50% heavier than females, have a broader face, somewhat smaller ears, and a large chest gland.
Female koalas have two mammae; and rather than a chest gland, have a pouch that opens to the rear and extends upward and forward.
In the south, males have an average head-body length of 78 centimeters and an average weight of 11.8 kilograms, while females have an average head-body length of 72 centimeters and an average weight of 7.9 kilograms. In the north, males average 6.5 kilograms and females 5.1 kilograms.
• Image | ©️ Adrian Midgley, Some Rights Reserved, (CC BY-NC-ND 2.0)
• Sources | (Dubuc & Eckroad, 1999; MacDonald, 1995; Nowak, 1999)