I was woken this morning by a new bird sound outside our home. It was strong and persistent. Whilst I can't properly describe it, the closest I could find to it on the website sounds was a Common Koel, though this doesn't align with locations.
We live adjoining a significant native bushland reserve (Wombolano) in Ringwood East, Vic, with many types of birds and other wildlife around.
Our backyard is almost exclusively native and particularly bird attracting.
Would love to hear suggested birds, so I can compare and listen for it again.
Koels are moving into Victoria, that is probablywhat it was.
I live in Tenterfield, NSW, near the QLD border and we are getting Koels coming down from the north for about the passed week now. They never stay here. All the migratory birds always head south. These Koels are moving a lot faster than normal this year.
I will add a personal observation about Koels to help you out. Koels do not call out when in flight. It is only when they are idle on a tree branch that is when they call out. If you hear it call out but then it stops, then a few minutes later you hear it call out again in a new location, it is a Koel. If it sounds like a Koel then it more than likely is a Koel. They have a very unique call and quite unmistakable. They are just extremely difficult to photograph as they rest in the top 1/3 of a tree and don't move about until they fly away. They are the only other bird species that will call out during all hours of the night (next to the Willy Wagtail).
Seeing or hearing Koels in Victoria would not surprise me actually. A lot of the bird species from up this way travel long distances because of the drought and heat we're getting up here. Up this way, Sulphur-crested Cockatoos, Little Corellas, and Yellow tailed Black Cockatoos, amongst some others, are now migatory birds, going around the country to breed, find food, etc. I no longer see Red-tailed Black Cockatoos anymore. The last one I saw was in 2005. They all headed south and they all came from Queensland. I've seen it happen here. Once the climate begins to subtly change and food becomes a little bit scarcer, birds head to greener areas.
I'm at Tenterfield, NSW. (Formerly known as "Hyperbirds".)