The first, 'Thirty-one Birds round Oxford by Sight and Sound', duration 13.40 minutes, helps us recognise birds local to the Oxford area by their song, and gives an indication of their habitat, stating where the recording was made.
The second, 'Oxfordshire's Lost Voices', duration 17.50 minutes, can be considered as a marker of environmental change. It features twenty-four birds (among them the nightingale, nightjar, marsh warbler and turtle dove) that have become rare or extinct in Oxfordshire over the last 100 years, mainly in the last 40.
By kind permission of Dr Andrew Gosler of the Ethno Ornithology World Atlas, Edward Grey Institute of Field Ornithology and Institute of Human Sciences, University of Oxford