1. ‘The Bittern, a brown heron, came close to dying out six years ago and conservationists feared there were only 11 ‘booming’ males left.’ ‘For every obvious crossbill, razorbill, greenfinch, woodpecker, warbler, treecreeper, swift or flycatcher there is a mysterious wigeon, garganey, gadwall, Bittern, siskin, pipit, shrike or twite.’