Most wild birds are beginning to nest at the moment.
It’s important to note that many native bird species nest in tree hollows: hollow branches and trunks in particular.
We humans have destroyed many of the tree hollows by either killing the tree or removing trees with hollows in them for fear they might fall over.
So many birds like parrots, cockatoos, owls, possums, bats etc. are declining in numbers due to the lack of hollow branches and trunks… Sort of an avian housing crisis.
However, you can build nesting-boxes out of marine plywood. Or you can buy them online from companies like “Nest Boxes Australia”.
The main factor limiting the numbers of most of these species of native wildlife is the availability of nesting hollows. By the way, avoid cheap ones as they fall apart.
You can do your bit.