Resources for data collection
The following is a selection of downloadable PDFs that contain useful information. Some are intended to aid with the collection of biometric data, such as moult codes and brood patch scores, whilst others are intended as reference materials to help in the field. Further information about what additional biometric information we recommend taking can be found on the Additional biometrics page.
|Ring size list||534 Kb|
|Errata - Identification Guide to European
Passerines - Svensson
|Ageing and sexing Grey Partridges|
Scotland's winter visitors: why and how do they migrate?
From geese and swans to thrushes and warblers, discover the secrets of our winter birds' migration.
BTO Data Reports
Our reports provide rigorous scientific information to inform Environmental Impact Assessments in the UK.