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“And although around 75% of the global population of Manx shearwaters breed on UK islands there were only 297 pairs on Lundy in 2001, way short of its potential considering its size and available habitat.” The UK is home to an estimated eight million breeding seabirds, with up to half of the EU populations of seabirds breeding here. View latest offers from National Trust Helen Booker, senior conservation officer for RSPB in South West of England, said: “This study clearly shows how quickly and positively seabirds respond to the removal of non-native predators.”Of course, we had anticipated major population increases when the project was launched, but the scale of this recovery has far exceeded our expectations.”Lundy warden Dean Jones added: “It is exciting to see this level of recovery in Manx shearwaters, one of our most important seabirds.”In spring the island comes alive at night with the sound of these amazing birds. The increases in puffins, guillemots and razorbills is also very encouraging for the future of seabirds on Lundy and we are maintaining our vigilance to ensure rats cannot return to the island.”This initiative was part of the Biosecurity for LIFE project, which aims to raise awareness of the risk to seabirds such as puffins, Manx shearwater and European storm-petrel from predators such as rats, stoats and mink.Measures include encouraging boat owners to check their boats, cargo and baggage, and for day trippers to check their bags and keep any foodstuffs in animal proof containers. Guillemots on the water off Lundy island in the Bristol Channel Seabirds are thriving on an island in the Bristol Channel because of a 15-year project which eradicated rats from the island.Puffins, Manx shearwater and guillemots are all seeing their populations dramatically increase because of the project by the RSPB, Natural England and the National Trust.The RSPB said the population of seabirds on Lundy has tripled to 21,000 birds, with the Manx shearwater population growing from 297 pairs to 5,504 and puffins increasing from just 13 birds to 375.The project, which was launched in 2002 by Natural England, the Landmark Trust, the National Trust and RSPB, aimed to eradicate the rats because they posed the biggest threat to the survival of the birds.After four years, Lundy was declared rat free and the seabird populations have since been steadily rising.Rodents are not native to the island; they were accidentally brought over on boats. The RSPB has said this is a problem they have to tackle on many of the islands they oversee.Rats predate the eggs and young of seabirds, especially ground-nesting animals like puffins, as their nests are easy to plunder.Rosie Hails, director of science and nature at the National Trust, said: “We were really concerned as previous records showed that puffin numbers on Lundy had plummeted from over 3,500 pairs in 1939 to fewer than 10 pairs in 2000. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily  Front Page newsletter and new  audio briefings. Guillemots on the water off Lundy island in the Bristol ChannelCredit:Ben Birchall/PA Wire read more