Something a little lighter. Lighter than a witch, if you will.

A radar image of a speed offender caught in central Switzerland last month has revealed that the culprit was not only a duck but probably a repeat offender, local authorities have said.

Police in the town of Köniz, near Bern, were astounded when they went through radar images snapped on 13 April to discover that a mallard was among those caught in the speed trap, the municipality said on its Facebook page at the weekend.

The duck was caught going 52km/h (32mph) in a 30-km/h zone, the post said.