Telegraph: The number of birds which migrate to the UK every Spring to breed is plummeting, a new study reveals. The fall in birds completing the annual journey from Africa has been so dramatic that scientists fear it is part of a seismic environmental change. The spotted flycatcher, turtle dove and tree pipit numbers have declined by more than 80 per cent while once familiar small songbirds such as the willow, marsh and garden warblers have declined by as much as 75 per cent. The …