(CNN) Actor Chris Hemsworth is calling for donations to help with Australian fire relief and has kicked it off with a $1 million donation of his own.

This year's bushfires in Australia have been devastating. More than 20 people and about half a billion animals, by one estimate , have lost their lives as the fires have burned through millions of acres.

Images from the scenes have rallied support from around the world.

"Like you, I want to support the fight against the bushfires here in Australia. My family and I are contributing a million dollars. Hopefully you guys can chip in too," Hemsworth said on Instagram. "I've added links to support the fire fighters, organisations and charities who are working flat out to provide support and relief during this devastating and challenging time."

Bushfires occur annually in Australia, but severe weather conditions have contributed to a season worse than the region has seen in decades. And the Australian summer has just begun.

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