When Ajay Tegala discovers that chaffinches, a small songbird, have a different accent every 30 miles, he’s intrigued. 

However, under threat from disease these birds are dying out in urban areas, and their unique urban songs may be lost for ever. But all is not lost. There's a way to find out how this disease is spreading...by recording their song.   
 
Follow Ajay and ecologist and UKYouth4Nature advocate Şeniz Mustafa as they search for this disappearing birdsong. 
To send Joe a chaffinch recording:   Identify a chaffinch. You can use apps like Merlin to help you make...