Estimates of population size are a key tool, used alongside population trend information and that on other aspects of bird ecology (such as survival and productivity rates) to assess conservation status. Periodic assessments of the size of breeding and wintering bird populations in the UK and in Great Britain are made by the Avian Population Estimates Panel (APEP). Their fourth assessment ‘APEP 4’ is published in the journal British Birds, and summarised here.

Click here for more information.: APEP 4 – Population estimates of birds in Great Britain and the United Kingdom | BTO – British Trust for Ornithology