The devastation of Australia's native animal population has the Greens calling for extra funding for wildlife rescue and an inquiry into how to rebuild numbers after the bushfires.

The fires are estimated to have already killed half a billion animals in NSW alone.

A wombat seen on the fireground in Tallowa Dam Rd in Kangaroo Valley. Credit:Wolter Peeters

Greens Senator for New South Wales Mehreen Faruqi has called for separate Commonwealth funding on top of the $2 billion announced for the National Bushfire Recovery Agency, to fund the treatment and rehabilitation of affected wildlife.

"Wildlife carers across the country are working round the clock to save our koalas, wombats, kangaroos and other animals so badly affected by bushfires," she said.