The Guardian: “…despite the obvious devotion of the most renowned literary voices of the last two centuries, the “chee chew chee chew” of the nightingale, the twittering of the house martin and the voice of the song thrush are heard no more in gardens, yards and balconies across many parts of Britain. In the last 50 years, Britain has lost an astonishing 73 million wild birds from its landscape, according to the British Trust for Ornithology (BTO). “What we have is a shifting baseline,” said Dr Rob Robinson, a senior scientist at the BTO who researches wild bird populations. “People engaging in nature today are going to think the numbers they are seeing are normal, particularly children. But if you go back 50 years, they would have been able to experience a much richer environment.”…As the symphony of birdsong known as the dawn chorus draws to its annual close at the end of June, the Guardian has recreated an audio landscape from across the past 50 years to try to portray the variety and plentitude of birdsong we have lost since tens of millions more birds were in full voice. The calls and songs of a variety of species have been isolated to build an illustration of the dawn chorus, representing a year in each decade, from now back to the abundance of the 1970s…”