Barn owls are one of the most loved and recognizable birds of the countryside.
They are found throughout the world, but are suffering population declines across their range.
In the UK for example, the Barn owl has steadily declined in numbers over the last century due to habitat loss, herbicide and rodenticide poisoning.
Their nocturnal nature makes it increasingly difficult to survey Barn owls and therefore a population size can be tricky to calculate.
However, owl nest boxes can provide a reliable way to monitor the presence of barn owls on a site, whilst also providing a nice safe nesting area for barn owl pairs to raise their young.