The British Trust for Ornithology describes it as a ‘nasal “dzwee”’; my description would be something like: stuttered twittering interspersed with long nasal wheezing. It’s an odd sound to make to attract a member of the opposite sex but it seems to work perfectly for the male Greenfinch. So, if you’re out walking and happen to hear a loud nasal wheezing from above, do look up. The Greenfinch is such a fabulous-looking bird and it has suffered a dramatic national decline in population since about 2005, so don’t miss any opportunity to see one.