008:
Feral horses are particularly destructive of Australia's natural environment, where our unique flora and fauna have evolved in the complete absence of hooved animals.
In conservation areas, such as the Park in question, all ferals are on the hit-list.
Our continued access is in large part dependent on successful management of the feral animal problem to reduce impact on the environment.
The alternative is to spend tax-payers money on professional helicopter shooting or aerial baiting, far less desirable courses of action in our view!

Here's a link to a Government fact sheet on feral equines in Australia's Northern Territory.