Orkney's vole boom revives rare birds of prey in 2025

Orkney has seen a sharp rise in vole numbers during spring 2025, reaching levels not recorded since 2019. This increase has boosted breeding success for birds of prey, including hen harriers and short-eared owls. Conservation efforts have also made progress in controlling invasive stoats across the islands. A recent survey found vole activity in over a third of the 1,082 small squares checked in 2025. The higher vole population has directly benefited predators that depend on them for food. Hen harriers, in particular, recorded their best breeding season since 2012, with 74 nesting sites on islands where stoats are present. Nearly 60 chicks successfully fledged, a significant improvement compared to previous years.

Short-eared owls have also thrived, with breeding numbers rising sharply. In 2025, they were confirmed at 55 sites on islands still affected by stoats, a notable increase from six years ago. Both species rely heavily on Orkney voles, making the rodents a key factor in their recovery. The Orkney Native Wildlife Project continues its work to protect vulnerable species, including curlews. Since 2019, over 8,500 stoats have been humanely trapped and removed from the islands. Detection dogs and strict biosecurity measures remain central to tracking and preventing further stout spread.

The rise in vole numbers has led to better breeding conditions for hen harriers and short-eared owls. Conservation efforts, including stout control, have played a role in supporting these populations. Ongoing monitoring will determine whether these positive trends continue in the coming years.