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Bird Species Database (BSD) is being compiled in a framework of the Arctic Birds Breeding Conditions Survey (ABBCS) of the International Wader Study Group (IWSG).  BSD aims at providing information on distribution, numbers and breeding status of birds in the Arctic, with the focus on last-breaking and, thus usually unpublished information. The primary source of data is questionnaires filled in by contributors to the ABBCS, while data from literature are being added occasionally.
Conditions for use of data
Data are provided with the intent that they are readily available for personal and public non-commercial use and may be reproduced, in part or in whole and by any means, without charge or further permission from IWSG. However, proper reference to contributors of the original data to the database must be provided in all cases, and due diligence should be exercised in ensuring the accuracy of the materials reproduced.
Read more about allowed data uses and citation guidelines here
Data are provided on an "as is" basis no responsibility by database manager(s), contributors of original data to the database or IWSG is accepted for uses or misuses.
Read more about possible data limitations here
Types of delivered information
1. Latitude and Longitude - in decimal degrees; negative values for the Western Hemisphere (GIS standard). 
2. Season - year of data collection
3. Abundance - takes the following values:
r - rare
c - common
a - abundant
4. Breeding status - takes the following values:
b - breeding
h - hatching
f - fledging
5. Nest/pair density per
6. Comment - additional information on any of the table fields
7. Period - time of field studies
8. Data provider - principal data contributor, or first author of the bibliographic data source
9. Data source -  takes the following values (important for proper citation):
qu - questionnaire
qb - questionnaire and literature
bi - literature
pc - personal communication