We could not have made this one up. From the BBC (p.s. the comments after the story are a must-read bonus):

Australian wallabies are eating opium poppies and creating crop circles as they hop around “as high as a kite”, a government official has said.

Lara Giddings, the attorney general for the island state of Tasmania, said the kangaroo-like marsupials were getting into poppy fields grown for medicine.
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