In 2013, St Agnes and Gugh began removing invasive rats brought by 18th-century shipwrecks; 12 years later, Manx shearwater breeding sites rose from 22 to a record 225
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September 17, 2026
In the latest 2025 monitoring data, St Agnes and Gugh recorded 225 apparently occupied breeding sites (AOBs) for Manx shearwaters In 2013, a major conservation effort began on St Agnes and Gugh in the Isles of Scilly to remove brown rats that had been…