The BBC has a story about wallabies causing crop circles [^] in Tasmania’s opium poppy fields. Apparently the wallabies get into the fields and sample the produce. Under the influence they then bounce around in circles until they crash – result, natural crop circles.
Northern Tasmania is one of the few places in world that poppies are legally-grown, with Australia producing around half of the world’s total output. The highly regulated opium poppies are used in the commercial production of codeine and morphine [^].
The above photo is a poppy field waiting to be harvested, taken near Scottsdale [^] during the CannibalRabbits Tour of Tasmania in January 1998. Yes, there is just a a normal farm fence, about waist-high, separating the field from the road – and a scary “Keep Out” sign!