Waterloo Regional Police investigators are scratching their heads after a lamb that was shot and killed by an unknown gunman on a farm south of Cambridge on Thursday afternoon.

A farmer called police shortly after 1:45 p.m. on Thursday afternoon, after he saw his flock scatter on his property in the West River and Beke Road area in North Dumfries Township.

When he went out to investigate, the farmer discovered one of his lambs was dead from a gunshot wound.

"This is the first time I've heard of something like this happening," Waterloo Regional Police Staff Sgt. Jeff Saunders said.

Saunders said police have no suspect in this case and wasn't sure what kind of person would kill a lamb in the first place.

"I have no idea," he said.

Police say the farmer reported seeing a light-coloured sedan driving away from his property on West River Road, heading towards Cambridge, but investigators don't know if the vehicle was involved.