Conservationists have condemned plans that would allow buzzard nests to be destroyed and the birds of prey taken into captivity to protect pheasant shoots.
The Environment Department (Defra) is to spend up to £375,000 researching ways to keep buzzards from targeting captive-reared pheasants.
Proposed methods include destroying nests to prevent birds breeding, catching and relocating buzzards to places such as falconry centres or providing alternative food sources for the predators.
The RSPB said the idea of taking wild buzzards into captivity or destroying their nests was "totally unacceptable", and criticised Defra for spending hundreds of thousands of pounds on the project when money was tight for conservation measures.
In a document setting out plans for the research project, Defra said the 2011 National Gamekeepers Organisation survey found that three quarters of gamekeepers (76%) believed buzzards had a harmful effect on pheasant shoots.
Buzzards are thought to target pheasant release pens if they find there is a readily available source of food and the Government's conservation agency Natural England has received a number of requests to license the killing of the bird of prey, which is a protected species.
In one case it was claimed that 25% to 30% of young pheasants were lost to buzzards, making the shoot unsustainable.
Buzzards have seen numbers increase by 146% between 1995 and 2009, although the increase appears to have levelled off between 2009 and 2010, according to the British Breeding Bird Survey.
But the RSPB said buzzards were eradicated from swathes of Britain by persecution and were only now recovering, as a result of legal protection and the warming of attitudes by many lowland land managers towards birds of prey.
Buzzards usually scavenge on animals which are already dead, but will sometimes take young pheasants released for sports shooting, the wildlife charity said.
Around 40 million pheasants, which are not native to the UK, are released for shooting each year and buzzards play only a small role in game bird losses compared to other factors such as collisions with cars, the RSPB said.
One study found just 1% to 2% of pheasants were taken on average by birds of prey.
The Government's document says the impact of buzzards on pheasant shoots has not been investigated and the extent of the issue was unclear.
But it said there were a number of sites where buzzards could be contributing to losses, and that there was an urgent need for management measures to reduce the impact on pheasant shoots.
The RSPB's conservation director Martin Harper said: "We are shocked by Defra's plans to destroy buzzard nests and to take buzzards into captivity to protect a non-native game bird released in its millions.
"Destroying nests is completely unjustified and catching and removing buzzards is unlikely to reduce predation levels, as another buzzard will quickly take its place.
"Both techniques would be illegal under current wildlife laws, and I think most people will agree with us that reaching for primitive measures such as imprisoning buzzards or destroying their nests, when wildlife and economic interests collide, is totally unacceptable."
Nigel Middleton, of the Hawk and Owl Conservation Trust, said destroying the nests of buzzards was tantamount to persecution.
"We believe that alternatives should always be sought to lethal control where the commercial interests of humans come into conflict with birds of prey.
And Mick Carroll, of the Northern England Raptor Forum, said: "Given that buzzards are still recovering from past persecution and there is no evidence they are a significant cause of loss, this is a scandalous waste of public money."
The conservation groups called for the Government to abandon the project.
A Defra spokeswoman said: "The buzzard population in this country has been protected for over 30 years, and as the RSPB says, has resulted in a fantastic conservation story.
"At the same time we have cases of buzzards preying on young pheasants. We are looking at funding research to find ways of protecting these young birds while making sure the buzzard population continues to thrive.
"This research is about maintaining the balance between captive and wild birds."
Shadow environment secretary Mary Creagh called for the Government to drop the project.
She said: "The restoration of the buzzard population has been a real success in recent years.
"It is astounding that Defra are wasting hundreds of thousands of pounds of taxpayers' money disrupting this protected species.
"This out-of-touch Government's priority is protecting the interests of large commercial shooting estates and non-native pheasants, rather than protecting our country's native species.
"The Government should drop this plan now. This has all the hallmarks of another Defra shambles."
David Taylor, shooting campaign manager for country sports group the Countryside Alliance, welcomed Defra's decision to commission the study.
"It is however disappointing that the situation has got to the point where such a study is required.
"Since the early 1980s, successive governments have had the ability to issue licences for buzzard control, but have been reluctant to do so because of their fear of coming under pressure from groups who have a narrow interest in birds of prey, often to the detriment of other species in Britain."
Tim Russell, director of conservation at the UK's largest shooting organisation, the British Association for Shooting and Conservation (BASC), said: "By commissioning this research Defra is showing its willingness to investigate how non-lethal methods might be used to solve serious problems with buzzards at the local level.
"In recent years there has been growing concern amongst some keepers that buzzards are causing serious damage around pheasant release pens. BASC believes that good scientific research is essential when making decisions about wildlife management and so we welcome this research."
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