Harvest mice are Britain's smallest rodent, dependent on tall grass habitats that have declined severely. Conservation actions supporting their populations improve individual animal welfare.
Harvest mouse welfare is directly determined by the availability of suitable tall grass habitat. As obligate grass stem climbers, harvest mice require dense, tall-stemmed grasses and rushes for both foraging and nest construction. The loss of traditional cereal field margins, uncut grass verges, and rough grassland through intensification has eliminated habitat across vast areas of their former range.
Agricultural machinery poses acute welfare threats during harvest season. Combine harvesters and silage cutters destroy harvest mouse nests and kill individuals that cannot escape rapidly enough. The timing of cutting operations — avoiding late summer and autumn cuts that coincide with nest activity — significantly reduces direct mortality. Leaving uncut margins of at least 2-3 meters around field edges provides refuge habitat and significantly reduces machinery mortality.