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Further up the beach, I spot several dead seabirds.

"Fish and seabirds could mistake them for food, leading to starvation and serious health issues," said Mr Duncan.

The area off Lincolnshire's coast is "a unique habitat for fish where seabirds and cetaceans feed" explained Mr Slater.

UK seabirds face threats from warming oceans, overfishing and avian flu.

A friendly zoo worker led me over to the enclosure, which was tucked in near the exit to the penguin and seabird exhibit.