The provision of nest boxes for cavity-nesting birds, bats and small mammals compensates for the loss of natural nesting sites in modern buildings and intensively managed woodlands, providing direct welfare benefits.
Nest box provision creates welfare benefits for cavity-nesting animals by providing safe breeding sites with appropriate thermal properties, protection from predators and sufficient space for developing young. The welfare value of nest boxes depends critically on design — boxes too small, poorly ventilated or inadequately protected from predators may cause harm rather than benefit. Swift bricks built into new construction are particularly welfare-valuable because they provide permanent sites that persist across decades and multiple generations of birds. Nest box monitoring through schemes like the BTO Nest Record Scheme also provides welfare data on breeding success that informs conservation decisions.