Causes of change. The demographic causes of the population increase appear to be an increase in the number of fledglings per breeding attempt, larger brood sizes and a decrease in daily …

Golden Oriole (previously Red-listed but which has not bred in the UK since 2009) now joins a Black List of eight other species now considered to have ceased breeding in the UK (including …

Causes of change. The causes of change are uncertain as detailed analyses have not been undertaken, but the number of fledglings per breeding attempt increased concurrently with the …

Recently there have been large changes to the order in which birds are listed to better reflect their evolutionary history based on new evidence from DNA studies. This article provides an …

BirdFacts covers all species that have been recorded in the wild in the UK, plus many non-native species that have become established here. BTO and partner organisations monitor the …

The British List. The list of bird species recorded in Britain. The latest list includes all species - 628 as at 14 June 2022 - recorded in a wild, or apparently wild, state in Britain, as recognised by …

In preparation for the initial release of DemOn, we issued a series of informative emails to all ringers and nest recorders. These provide a general overview of DemOn, along with a brief …

Britain and Ireland together hold almost the entire world population of the distinctive dark-backed race yarrellii (Pied Wagtail), and for this reason population changes in the UK are of global …

Project timeline. 1909 Ringing began in Britain & Ireland; 1937 BTO took over running of the Ringing Scheme; 1957 Ringers’ Bulletin launched; 1965 First edition of the Ringers’ Manual …

Project timeline. 2002 Migration watch started, with the initial aim of mapping migration; 2004 Re-named BirdTrack and expanded to cover all seasons; 2013 BirdTrack apps released on iOS …