Port Macquarie Intergrade....Some refer to them as Port Mac Intergrade, others as Northern Rainforest Diamonds. Contrary to popular belief, they are not a 'cross bred' snake. They are a naturally occurring locale of the species - there is some conjecture that they were the result of interbreeding for thousands of years between the Diamonds and Coastals due to their locale being in the 'intergrade' zone of the two species. There are other theories that contradict this.
Either way....They are a naturally occurring locale in this area, however they came about. There are plenty of them about the area - a lovely specimen was recently seen in a palm tree about 200 metres from where I live. They do well in the 'green zones' around town....with urbanisation comes rats and mice.....add a few 'green zones' through town to allow for koala movement and you get a reasonable habitat for them.