Western Shield

Poison coated oats and carrots were occasionally used to control herbivorous invasive species, including rabbits and rats.

They cover an area greater than half the size of Tasmania as they deliver bait into most national parks, nature reserves and state forests of the south-west of Western Australia.

The species taken off "Schedule 1 – fauna that is rare or is likely to become extinct" were the quenda (Isoodon obesulus), the tammar wallaby (Macropus eugenii) and the woylie (Bettongia penicillata).

The woylie was also taken off the IUCN Red List of the world's threatened fauna as "endangered" and downgraded to "lower risk / conservation dependent".

The woylie has been added back to WA's list of threatened fauna due to the sharp declines since 2002, with some places having as much as a 95% decrease (including that locality near the Upper Warren in Manjimup, where the original sevenfold increase occurred).

Western Shield's Gilbert's potoroo subdivision, led by Dr. Tony Friend, now has a self-sustaining mainland wild population, a breeding center "back up" stock with a cross fostering program for long-nosed potoroos, and an island home for breeding animals on Bald Island.

Future frontiers for Western Shield include: efforts in the desert regions, the creation of an effective feral cat bait, and biological invasive species control.

All of these measures are aimed at reducing the number of endangered species and returning WA to the bio-diverse haven it was prior to European settlement.