The Isles of Scilly, a remote paradise off the coast of Cornwall, could be facing a hidden ecological threat. Wildlife experts have issued a warning after a possible sighting of weasels was reported on St Mary’s Island. Although weasels are small in size, they are invasive predators that can cause significant damage to local wildlife, especially land-nesting seabirds.
The Isles of Scilly Wildlife Trust (IOSWT) has expressed serious concerns about the fragile ecological balance of the islands. The islands are home to the storm petrel, a rare seabird species that is highly vulnerable to predators such as rats, mice and now potentially weasels. Trained sniffer dogs were deployed earlier this year to track down the invasive rodents, underscoring the region’s proactive approach to protecting biodiversity.
Weasels, although native to mainland Britain, are not native to the Isles of Scilly. Their introduction, even unintentionally, could lead to a sharp decline in the vulnerable species’ population, with a cascade of ecological consequences.
Residents and visitors are being urged to remain vigilant. The latest sighting was near the Garrison, a historic site on St Mary’s Island. Local residents are advised to report any signs of weasels to IOSWT immediately to prevent irreversible ecological damage.
This incident highlights the importance of monitoring invasive species and protecting unique island ecosystems. Small actions such as reporting sightings can make a big difference in preserving the UK's natural heritage.
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