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Speaking on Sunrise alongside his mum Terri, the evidently emotional 16-year-old Robert said: "It's definitely an ongoing issue and we're just trying to do our best to help in any way we can.
"But it's a pretty tough situation. We're absolutely heartbroken."
"Being able to treat and help koalas is few and far between because they're basically incinerated"
Terri Irwin chats about the devastating impact of Australia's bushfires on our vulnerable koala population.
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Terri then went on to explain why the fires have had such a devastating impact on the country's koala population.
She said: "The consideration with koalas is that their instinct is to go up, safety is in the top of the tree, and with a hot fire, eucalyptus trees have so much oil in their leaves they actually ignite and explode. So being able to treat koalas is few and far between because they're basically incinerated, which is absolutely heartbreaking.
"But now is the time we need to look at more than just setting aside habitat. Koalas are classed as vulnerable and I think that after this event we need to really sit down and look at classing them as endangered and protecting our icons, our kangaroos, our koalas."
Bindi Irwin announced in an Instagram post last week that the family's wildlife hospital had helped treat more than 90,000 animals.
The post read: "With so many devastating fires within Australia, my heart breaks for the people and wildlife who have lost so much. I wanted to let you know that we are SAFE. There are no fires near us @AustraliaZoo or our conservation properties. Our Wildlife Hospital is busier than ever though, having officially treated over 90,000 patients.
"My parents dedicated our Australia Zoo Wildlife Hospital to my beautiful grandmother. We will continue to honour her by being Wildlife Warriors and saving as many lives as we can."
Robert said the fires had harmed animals in a variety of different ways.
He said: "We're seeing all kinds of different injuries.
"Obviously smoke inhalation and burns are happening frequently, but also animals are going into areas where they're not supposed to be to escape the horrific conditions."
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