Garden BirdWatch (GBW)

Garden BirdWatch monitors the changing fortunes of birds and other garden wildlife through its network of 'citizen scientists'. Observations collected by BTO Garden BirdWatchers are analysed by BTO researchers and published in leading journals. BTO Garden BirdWatchers have charted the decline of the House Sparrow, the rise of the Woodpigeon, have discovered that urban birds get up later than their rural counterparts and have alerted conservationists to the impact of an emerging disease in Greenfinches. Find out more about Garden BirdWatch.


Latest GBW News

Juvenile Bullfinch, by John Harding

Identifying juvenile birds

You can tell when the first young birds have fledged by the increase in calls we get from puzzled members of the public, unsure as to what they are seeing. This is because many juvenile birds look a little different to their parents. Read on to find out why and how to identify some of the more confusing common garden juveniles.

Warm weather boosts garden butterflies

All it takes is a few days of warm sunshine for butterfly numbers to rocket, and in April they did just that. The latest Garden BirdWatch results show fantastic new records for Peacock, Small Tortoiseshell and Brimstone. 

Blue Tit, by Jill Pakenham

Garden BirdWatch celebrates 20 years

This year we're celebrating 20 years of GBW and we'd like to thank our dedicated supporters - without them there wouldn't be a survey. In the last 20 years:

  • GBW volunteers have contributed an astonishing 7.3 million hours of their time submitting just under 100 million observations.
  • 481 different species have been recorded from several taxa. 
  • 30,271 gardens have contributed at least one week of data.
  • An average of one scientific paper has been produced per year including several investigating the decline of the UK's House Sparrow population, which was first discovered through the BTO's garden-based data.