In 2004, for instance, researchers showed that individual nightingales made their songs very much louder so they could be heard
over urban noise (see Urban nightingales» songs are illegally loud).
Driving down the dusty main road of Butembo — a city of
over half a million people, in the eastern DRC province of North Kivu — I hear the usual
urban Congolese
noises of motorcycles and lorries driving madly by.