Barn owls have declined sharply in many regions due to changes in farming practices that reduce prey availability and nesting sites.
Barn owls suffering from rodenticide poisoning experience neurological damage and prolonged death. Loss of foraging habitat due to monoculture farming causes starvation, particularly in winter. Barn owls with injured wing or eye function cannot hunt effectively and slowly starve. The transition to intensive farming has removed both their home and their food supply.