Australia boasts a stunning array of unique wildlife. They feature on our coat of arms and they're placed front and centre in our tourism campaigns. But the reality is, many of our native animals are in danger.

Australia has one of the worst extinction rates on the planet and the problem is growing. There are currently more than 500 animal species under threat.

Four Corners investigates how Australia has found itself in the midst of an extinction crisis.

Two years on from the Four Corners investigation into water theft in the Murray-Darling Basin that sparked a royal commission, the program returns to the river system to investigate new concerns about how the plan to rescue it is being carried out.

The river system is the lifeblood of Australian agriculture but right now it's in crisis. It's experiencing one of the worst droughts on record, and with mass fish deaths capturing the headlines and farmers struggling to survive, many are saying the scheme is failing to deliver.

Four Corners investigates whether the contentious Murray-Darling Basin plan has become a colossal waste of taxpayers' money.