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The Wetlands and Wildlife Care Center rescued nearly 200 seabirds in total, which Dazey said was an abnormally large number.

They said the absence of rats and other predators on the island had also contributed to the seabirds' success.

Pollution for the pier remains a problem, worsened by urban runoff and high levels of water-contaminating activities, such as the disposal of fish guts from recreational fishing, which attracts seabirds.

Sandeels are a vital source of food for seabirds that live along the UK coastline.

Conservation groups are urging ministers to reject plans for an offshore wind farm which the developer predicts will kill tens of thousands of seabirds.