Australia's wild desert horses: 'This environment tests them to their limits' | 7.30

The number of wild horses, known as brumbies, roaming free in Australia's red centre is growing by about 20 per cent every year.
That means there's a risk that nature won't keep producing enough food to feed all of them.
At the same time, though, that there are questions over the wild horses' sustainability, they're becoming a drawcard for tourists from around the country and overseas.
Regional reporter Leonie Mellor has the story.
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