By 2008 it was estimated the park contained a bilby population of around 300.
The bilby prefers arid habitats because of the spinifex grass and the acacia shrubs.
Unlike its living relative the greater bilby, the lesser bilby was described as aggressive and tenacious.
The decline in numbers of the lesser bilby and ultimately its extinction was attributed to several different factors.
Introduced feral cats and foxes pose a major threat to the bilby's survival, and there is some competition between bilbies and rabbits for food.
In 2014 scientists found part of a fossilised jaw of a bilby which had shorter teeth likely used for eating forest fruit.
The female bilby's pouch faces backwards, which prevents her pouch from getting filled with dirt while she is digging.
The story helped catalyze the public's interest in saving the bilby.
