Do you remember the female hen harrier that stayed at Fowlmere for a couple of months last winter? It was often seen well from Reedbed Hide, but views from Drewer Hide, although close, were frustratingly brief.
See photo here http://www.birdguides.com/webzine/article.asp?a=3567 in Birdguides article about bird of prey persecution.
Recently we have been coppicing and pollarding the willows in front of Drewer Hide, which means that occupants of the hide can see wider and further than before. We had planned to do it last winter, but the harrier turned up before us, and we didn't want to risk putting such a super bird off.
"Why not just remove them?", you may ask. Some of these willows have been there long enough to have developed convoluted, gnarled trunks that are good for invertebrates, and RSPB nature reserves are all about diversity after all. Thus I prefer to cut back the growth every few years, which allows the trunks to develop and also put out fresh young shoots for those specialist insects that need them.
Now we just need that harrier to appear...