Cape Barren geese live mostly on small, windswept and generally uninhabited offshore islands, but venture to adjacent mainland farming areas in search of food in summer. Their ability to drink salt or brackish water allows numbers of geese to remain on offshore islands all year round.
Thank you Google for the info.
These geese were at The Nobbies, an area on Phillip Island that has very pretty scenery and is often visited by Fairy Penguins which is one of the things that most tourists associate with Phillip Island.