For those who is wondering what is a Joey, you can checkout the below definition which I adapt from Wikipedia. (Read More here)
The Sugar Glider (Petaurus breviceps) is a small gliding possum native to eastern and northern mainland Australia, New Guinea, and the Bismarck Archipelago, and introduced to Tasmania.
The Sugar Glider is around 16 to 21 cm (6.3 to 7.5 inches) in length, with a tail almost as long as the body and almost as thick as a human thumb, and weighs between 90 and 150 grams (3 to 5.3 oz). The fur is generally pearl grey, with black and cream patches on the underbelly and black or grey ears. Other colour variations include leucistic and albino recessive traits. The tail tapers only moderately and the last quarter of it is black, often with a dark tip. The muzzle is short and rounded. Northern forms tend to be brown coloured rather than grey and, as predicted by Bergmann's Rule, smaller.