Nest box provision schemes are among the most widely adopted wildlife interventions. Evidence on their effectiveness reveals important lessons about design, placement, and long-term monitoring.
Nest box provision is one of the most evidence-based and cost-effective wildlife welfare interventions available to individuals and organisations. By compensating for the loss of natural cavities, nest boxes directly improve breeding success, chick survival, and population resilience for cavity-nesting birds. The welfare benefit is most pronounced during cold springs when late-fledging birds benefit from the insulation of boxes versus open nests. Poorly designed or maintained boxes can harm rather than help — boxes with incorrect entrance holes allow predation, and boxes not cleaned annually accumulate parasites that reduce chick survival. Done well, nest box schemes contribute measurable welfare and conservation gains at very low cost per bird benefited.