Little owls are a naturalized UK species experiencing significant population decline, linked to loss of old pastures, rough grassland, and prey availability.
Loss of earthworm-rich permanent pasture reduces primary prey availability causing nutritional stress. Pesticide reduction of invertebrate prey affects chick feeding. Nest site loss from orchard removal causes breeding failure. Road mortality affects individuals in areas with high traffic density. Cold wet springs reduce invertebrate activity causing chick starvation.