The cull is taking place because experts believe that the Ruddy Duck (an escaped introduction from North America) is threatening the endangered white-headed Duck.
Junior environment minister, Richard Benyon, said:
Defra considers the programme to date has been very effective. We remain committed to continuing the eradication programme through to completion.
Alas the RSPB and WWT support the cull. According to the RSPB's David Hoccom:
It is very sad that such measures are necessary, but we expect the white-headed duck's future to be more secure as a result.
The white-headed duck has undergone a rapid worldwide decline over the last decade, making extinction a real possibility.
I can't really comment on the science, where many argue that without a European side cull its pretty pointless, but I'll miss the little chappy they are such a happy looking bird. The curious thing is that if two Northern American birds flew over that would be nature and the cull would have never happened.