Badgers,raptors,cats and changes in farming practice have all contributed to certain species of birds demise
Along with general bunny hugger attitudes,ie take marten they will wipe out a nest,can't do a thing about it,I mean they are bonny but everything has a balance
Years ago keepers could manage the country as they saw fit whereas now you have to apply for licences,buzzards,which you never get
Everything has it's place but some are beginning to take over,ie badger as Stag says peewits and partridge have suffered not to mention hedgehogs