"Melbourne, Vic. 1944-02-29. A papier-mache cow, used for milking demonstrations at the Werribee experimental farm, being tied on to the luggage carrier of Mrs O. Mellor's car for transport to the farm. Mrs Mellor is Field Officer in charge of the Women's Land Army Mont Park training depot.
The Australian War Memorial currently has an exhibition on animals in war ('A is for Animals') and the latest issue of their magazine Wartime features the 'exploding rat' developed by the Special Operations Executive. There's an 'interactive' display at the UK National Archives site (source of the above image). On the Australian War Memorial site one can also read about the Dickin Medal ("the animals' VC").