Three tons of medicated pheasant food has been stolen from a barn in what police say is a "very unusual theft".
They say a lorry would have been needed to move the food, stolen from a farm near Banbury, Oxfordshire.
The theft took place on Upper Park Farm, part of the Great Tew Estate, near Chipping Norton, on Tuesday night.
"This is a very unusual theft and there cannot be very many places where people can dispose of stolen property like this," said a police spokesman.
"The food is only good for pheasants and not any other animal.
"If anybody is offered this food we would like them to contact us."