Scotland’s Shiant Isles are Now Officially Rat Free

The remote islands off the coast of Scotland have been declared free of invasive rats. This victory offers a brighter future for the seabirds that nest there.


Scotland’s Shiant Islands are an important nesting spot for seabirds. Credit: Lews Castle UHI

A remote cluster of islands in the Outer Hebrides have been declared rat free, thanks to a 4-year project to eradicate invasive rodents and protect this important habitat as a haven for nesting seabirds.

These isles are home to the most important seabird breeding colony in Europe; they host about 100,000 pairs of nesting seabirds each year, including Puffins, Guillemots, and Razorbills. However, invasive rats that probably reached the islands from a shipwreck reduced the birds’ breeding success. Rats prey on chicks and eggs and conservationists feared this could decimate the breeding colony.


Removal of invasive rodents allows birds like puffins to nest successfully. Credit: Stephen Archer

The Shiants Seabird Recovery Project had two main steps. The first stage was to eradicate the invasive Black Rat. This was carried out by Wildlife Management International Limited and 15 volunteers. Since then they have been monitoring for signs of rats, with the last check in February coming back clean. The islands had been officially rat-free for two years and could finally be announced as such with certainty.

The second step of the project was to encourage other seabirds such as the Manx Shearwater and European Storm Petrels to breed on the Shiant Isles. Both are species that are not found on islands with rats so they are important indicators of biodiversity and a successful restoration. Conservationists were excited to witness the first recorded Storm Petrel on the Shiants last summer. Now, after the successful eradication project, they believe a range of seabirds species, many of which are suffering major declines, will have a better chance of survival.

In order to ensure that the islands remain free of rats and other invasive predators, visitors are asked to follow simple biosecurity measures. This includes checking boats for any sign of rodents before departing for the islands and while ashore.

This project has been a huge success and has played a vital role in developing future island restoration and biosecurity work in the UK. Charlie Main, Senior Project Manager for the Shiant Isles Recovery Project said:

This is an absolutely fantastic moment for the Shiant Isles and everyone involved in the project is delighted that they are now officially rat free. With so many of Scotland’s seabird populations in decline it’s vital that we do all we can to help them.

Featured photo: A European Storm Petrel Flying over the ocean. Credit: Alexandre Roux

Source: RSPB

About Noelle Duerwald

Noelle is an undergraduate student at the University of California, Santa Cruz studying Ecology and Evolutionary Biology. She fell in love with the ocean when she was a child on her grandpa's sailboat. Ever since she has had a passion for conservation and protecting endangered species. She is thrilled to support Island Conservation in its mission of preventing extinctions as a volunteer for the Communications and Science departments. In her free time Noelle enjoys cooking, hiking, and scuba diving in the kelp forests of Monterey Bay.

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