Little owls have declined significantly in the UK as agricultural intensification removes the rough grassland, old orchards, and farm buildings that support their prey base and nesting opportunities.
Little owls in poor prey habitats produce underweight chicks with reduced survival prospects. Pesticide use reduces invertebrate prey availability, causing parents to travel greater distances and deliver fewer meals. Chicks that cannot be fed adequately experience starvation over days rather than hours — a prolonged welfare harm. Adults that collide with vehicles on rural roads suffer traumatic injury; little owls have low flight height and are vulnerable to agricultural machinery. Nest site loss forces pairs to attempt breeding in suboptimal locations with lower productivity.