In this photo provided by the Northern Territory Government, a humpback whale swims in the East Alligator River in the Kakadu National Park in Australia's Northern Territory, on Sept. 10, 2020. Whales have never been seen before in the East Alligator River in the Northern Territory's World Heritage-listed Kakadu National Park and no one can explain why at least three of the blue water mammals ventured so deep inland in a river with almost zero visibility.
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