To dream of kangaroos is indicative of parental protection, both maternal and paternal. This may be a characteristic of yourself that you would like to express.
Kangaroos in dreams may also be representative of anger or desire to fight. Being attacked by a kangaroo is symbolic of false accusations accosting you in the future. Be aware of these accusations as they put your reputation and good name at risk.
To dream about Australia means that you believe you are being tugged toward opposing poles. It might also symbolize a deep look into your unfettered inner self. Australia, known as the 'land down under,' could represent your innermost buried thoughts.