The rodents are causing huge damage for farmers along the country’s east coast by feasting on crops.
The shocking extent of the plague has been revealed in a map by the Mouse Alert app.
The map shows a large swathe of red circles along 1,000km of the east coast, meaning a high number of rodents have been recorded in the area.
The infestations are continuing to spread due to perfect conditions for the mice created by heavy rains after hot and dry weather.