Not aliens but kangaroos are making the circles on opium poppy fields in Tasmania. Recently the mysterious circles have appeared from time to time around the fields that are the legal poppy plantations grown for morphine and used by the pharmaceutical industry.
Apparently, wallabies (small or medium-sized kangaroos) discovered that poppies can actually make them feel happy.
"They would just come and eat some poppies and they would go away. They’d come back again and they would do their circle work in the paddock," said Lyndley Chopping, the farmer who grew poppies for more than 30 years, quoted by abc.
Read the full story at www.abc.net.au/news