A farmer has contacted police after finding obscene graffiti - sprayed on four of his sheep.
The sheep were grazing on an isolated field at Marston Lane in East Farndon, Northants. Their owner discovered them on Monday in a distressed state.
The sheep had been sprayed with red and blue paint. A Northants Police spokesman said they were treating the incident as criminal damage.
Police said the incident is believed to have happened on Sunday night.
After the farmer reported the crime, the sheep were rounded up by police to be photographed by scenes of crime officers.
Anyone with any information is asked to call Northants Police.