Harvest mice are Britain's smallest rodent and have declined substantially with loss of rough grassland and cereal field margins, with welfare and conservation interdependence on agricultural management.
Harvest mouse welfare is closely tied to vegetation structure availability. Animals disrupted from breeding nest sites during mechanical harvesting face the acute stress of sudden exposure and predation risk. Nest destruction during harvest can kill dependent young directly. The winter welfare of harvest mice depends on sufficient standing vegetation to provide shelter and food — field margins left uncut and reedbeds provide year-round habitat that reduces winter mortality. The creation of grass buffer strips — even narrow ones of 2-3 metres — along field boundaries provides habitat connectivity that allows harvest mouse populations to persist in agricultural landscapes. Existing habitat networks need to be maintained and extended to provide the contiguous vegetation structure the species needs.