Our project team have fitted more than 10 young hen harriers with satellite tags this summer in Scotland. We have worked hard this summer to tag birds from the Scottish Borders up to the Scottish Highlands, with the generous support and assistance from of a variety of partners, volunteers, landowners, their managers and staff, and licenced taggers from the raptor conservation community.
One of this year's Scottish youngsters (image courtesy of Steve Downing)
Hen harriers are one of our rarest and most persecuted birds of prey. The satellite tags allow us to follow the lives of the young birds as they strike out on their own. The last British Isles hen harrier population survey in 2016 put their numbers at just 575 territorial pairs, an overall significant decline of 24 percent since 2004. Estimates suggest there should be over 1,500 pairs of hen harriers in Scotland alone, yet only 460 pairs were recorded in 2016.
Before tagging could take place, we monitored hen harrier nests across the country to understand more about how their breeding success varies year to year and why nests sometimes fail. The information gathered from birds tagged in previous years has revealed important information about how they spend their first few years of their lives. Two of the birds tagged in Scotland last summer headed over to Ireland for the winter before returning this spring, and one of the chicks tagged this year is the offspring of a female tagged in a previous year by the project, providing an opportunity to follow the species through two generations.
Tagging also reveals some worrying turns of events, with some birds either suddenly or inexplicably disappearing or being illegally killed – almost always on or close to grouse moors. Earlier this year RSPB Scotland appealed for information on the disappearances in areas managed for grouse shooting of two birds tagged by the project – Marci, tagged in 2018 at Mar Lodge and last recorded in the Cairngorms National Park near Strathdon, and Skylar, tagged in 2017 in Argyll who disappeared close to Elvanfoot. In May this year, Rannoch, tagged in 2017, was found dead in an illegally set spring trap on a Perthshire grouse moor.
Dr Cathleen Thomas, Senior Project Manager for Hen Harrier LIFE, said: “It’s a real privilege to work with and follow the journeys of these incredible birds of prey and the sight of one of them skydancing never fails to take my breath away.
“However, very few people get to experience such a spectacle as the British Isles are missing 80 percent of the breeding hen harriers they could support. These birds face enough natural challenges in their first few years of life trying to avoid predators and learn how to hunt without the added pressure of illegal killing, shooting and trapping by humans.
“With Scotland being the stronghold for the British hen harrier population, tagging these young birds here and understanding what is happening to them is crucial for our efforts to create a more secure long-term future for the species.”
An independent enquiry commissioned by the Scottish Government is currently undertaking a review of the environmental impact of grouse moor management and possible options for regulation. RSPB Scotland is calling for licencing of the industry to be introduced to bring an end to the continued illegal killing of birds of prey, including hen harriers as well as golden eagles, red kites and others, which is threatening some of the country’s most iconic species.
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