
How did little over ten grey squirrels, brought to an Aberdeen zoo in 1971 to keep a tame squirrel called Jack company, turn into a population of over ten thousand? What does it take to eradicate an invasive species from a city? And could this project become the first urban grey squirrel eradication anywhere in the world? To discuss all of this I'm joined by James Kennedy, the Eradication Operations Lead for Saving Scotland's Red Squirrels (SSRS), a partnership project run by the Scottish Wildlife Trust. James has been on the ground since 2009, starting as a Grey Squirrel Control Officer on what was supposed to be an eighteen-month contract. Here he is, seventeen years later, closer than ever to achieving something many thought impossible.
During our conversation, James explains why grey squirrels are such a serious problem for native red squirrels and for the wider environment. It's not just about competition for food and habitat. Grey squirrels carry squirrelpox virus, which is lethal to red squirrels, usually killing them within a fortnight. They also cause millions of pounds of damage through bark stripping of trees, threatening both ancient woodlands and commercial forestry. We also discuss the role of pine martens in suppressing grey squirrel populations, a topic that is surprisingly emotive in conservation circles, and how the situation in Ireland offers some encouraging signs for red squirrel recovery.
James takes us through the practical realities of running an urban trapping operation, from getting the backing of Aberdeen City Council to managing a trap loan scheme with local residents. He shares stories of public encounters, both positive and hostile, and explains why education and patience matter when dealing with a controversial subject. We also look at alternative approaches such as fertility control and gene drive technology. But as James puts it, nothing currently replaces boots on the ground. With grey squirrel captures down to just two in 2025 and detection dogs now being deployed, the project is entering its confirmation phase. If you care about invasive species management and what is possible with long-term commitment, this is an episode you don't want to miss.
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