Common Ring-tailed Possum
Pseudocheirus peregrinus

These possums are common down the eastern coastal regions of Australia from northern Queensland to Adelaide. They make a curious twittering noise as they forage for leaves at night, eating eucalypts which many other animals cannot digest. They have two young at a time during the winter/spring, which remain the pouch for some months and then travels by clinging to the mother.
 

1: Mitchell Park, NSW, 05/06/2010.