Data

Information published on our website

Facts and Figures on British birds
Trends in numbers and breeding performance over 50 years
Which birds can be found near you

BTO survey information

Detailed Information on BTO Surveys

Search for data

Find out what Survey Data are available
Search for BTO survey information on a SPECIES
Search for BTO survey information about an AREA
Request data from the BTO

BTO data policies

The BTO's Data Policy
The BTO statement on Data Quality
Data on Sensitive Species - BTO statement

BTO and the Cambridge Conservation Initiative

Learn about our partnership with the CCI and how it helps us contribute to bird conservation on a global scale.

Tagged Lesser Black-backed Gull. Gary Clewley

Article

Bird tracking

Phil Atkinson explains the technology behind tracking.

Blog

BirdTrack migration blog (end of October to mid November)

Even as we reach the beginning of November, autumn migration is still very evident. Birds continue to arrive in the UK from more northerly regions to spend the next few months here in our warmer winters, before...