The terns in the middle of the colony probably have good reasons for being there.
The RSPB hopes works will be complete by May before the little terns return.
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Little terns visit the area in the summer to nest and rear their young.
The beach at South Biness Island has been replenished to protect little terns' nesting areas from flooding.
In the Gulf in May, with the oil gushing, were loons, gannets, various kinds of herons and terns.
The island is a haven for migratory birds and a breeding ground for terns, frigates and tropical birds.
At this time of year in the gulf, loggerhead turtles are migrating, terns are breeding and tuna are spawning.
The number of little terns pairs nesting on the south coast has dropped by more two thirds since the 1980s.
Derwick and Leslie Ramsey, of Amble, Northumberland, said they went to Coquet Island to collect shellfish and were unaware of nesting Roseate Terns.
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No amount of boom will protect waterbirds like pelicans, gulls and terns, because diving into the water for fish is how they eat.
Terns and gulls breed on islets unspoiled by human activities.
Denbighshire Council erected the one and a half mile fence to help a colony of Little Terns who fly into Gronant, Prestatyn from west Africa every may.
However, he walked round the island and past the terraces where 71 pairs of the terns - one of the few UK breeding colonies - were nesting.
Derwick and Leslie Ramsey, from Amble, claimed they had landed on the island to collect shellfish and were unaware of the nesting Roseate Terns, Bedlington magistrates heard.
Species of beach-nesting terns and gulls, beach-nesting shorebirds, large wading birds, marsh birds and ocean-dwelling birds are also at risk, along with migratory shorebirds and songbirds, the Initiative said.
The island is alive with the constant fluttering and cacophony of cawing, flapping and squabbling of more than 70, 000 gannets as well as kittiwakes, Arctic terns, puffins, razorbills and shearwaters.
The peninsula is a haven for wildlife: humpback whales in the crystal blue water, elephant seals beached on Pleneau Island, squawking adelie, chinstrap and gentoo penguins, and wheeling cormorants, petrels and terns.
Every species on the island retreated to a small islet offshore, Boatswainbird Island, except for a few individuals that held on to the most inaccessible cliffs, and the phenomenally scrappy wide-awake terns that visit the southern plains to breed.
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