Study suggesting widespread illegal killing of hen harriers on English grouse moors published

Research published today in Nature Communications shows the likelihood of hen harriers dying, or disappearing is ten times higher in areas covered by grouse moor

Published 19 March 2019

A new study reveals that young hen harriers in England suffer abnormally high mortality compared to populations in Orkney and mainland Scotland and the study provides compelling evidence that the most likely cause is illegal killing in areas associated with grouse moor management.

Published today in Nature Communications this paper represents the culmination of a 10-year Natural England study involving 58 satellite tagged hen harriers. The analyses have been led by the University of Cape Town and Aberdeen University with the provision of land use data by the RSPB.

The study showed the likelihood of hen harriers dying, or disappearing, was ten times higher within areas predominantly covered by grouse moor, compared to areas with no grouse moor. The study revealed that 72% of tagged harriers were either confirmed or considered very likely to have been illegally killed.

The hen harrier, sometimes called the ‘skydancer’ because of its amazing acrobatic display in the breeding season, is one of England’s rarest birds and is legally protected. Illegal killing of hen harriers has long been thought to limit their population size, but identifying the scale of these crimes and their impact on harrier populations has been difficult because they occur in remote areas and evidence is likely to be destroyed, thus successful prosecutions are rare.

This long-term study has enabled patterns of disappearances to be assessed across a large number of birds. This provides overwhelming evidence that illegal killing is occurring on some grouse moors, where some gamekeepers view hen harriers as a threat to their grouse stocks.

Rob Cooke, Natural England Director said:

This research identifies the scale of the problem hen harriers have faced on grouse moors. It makes for sobering reading and shows how vital it is that everyone involved in the future of this wonderful bird pulls together. Natural England is working in partnership with a wide range of stakeholders, including moorland communities, conservation organisations, police and landowners to implement the joint Hen Harrier Action Plan which aims to improve the conservation status of this at-risk bird.

Last year’s Hen Harrier breeding season was the most successful in over a decade with 34 chicks fledged across the country. While this was very encouraging we recognise that a continued partnership approach is required to combat illegal persecution of these rare birds and ensure that numbers of breeding hen harriers continue to grow.”

Continued