Stoned wallaby crop circles

The strange occurrence that was revealed in a State Government Budget Estimates hearing, has also solved what some growers say has spurred a campfire legend about mysterious crop circles that appear in northern Tasmania's poppy paddocks.

Tasmanian Alkaloids field operations manager Rick Rockliff said wildlife and livestock that ate the poppies were known to "act weird" including deer in the state's highlands and sheep.

"There have been many stories about sheep that have eaten some of the poppies after harvesting and they all walk around in circles," Mr Rockliff said.

In true X-Files-style, Attorney-General Lara Giddings said the drugged out wallabies had been found hopping around in circles squashing the poppies, creating the formations – and hence solving the mystery.