A Green Catbird.
They're named as such, due to their call, which is similar to a cat's yowl, or sometimes a baby's cry.
Primarily a fruit eating bird (they're quite partial to many varieties of Australian figs (which aren't really figs)), they're usually difficult to spot in the tree tops as their green colouring blends in very well.
Spring has definitely returned, as has our resident Forest Kingfishers. Here is one of them happily perched on the perching stick I erected in the back yard (right outside our back door).
From here, birds can survey the backyard looking for prey (in this guys case, grubs, beetles, slow-moving flies or bees, the odd worm).