The BTO Breeding Bird Survey survey has recorded a 49% decline in Starlings across the UK since 1995. Why numbers have dropped so dramatically is not fully known. Retrapping Adults for Survival (RAS) projects are helping find out whether adult mortality is a possible cause.

Click on the link to read the rest of the article: BTO Bird Ringing – ‘Demog Blog’: The Big Biggleswade Starling RAS