We’ve just finished updating the Birdstack database to conform with version 2.0 of the IOC’s world bird list. If your data was affected by any splits or lumps, you will have a notification. For help with the upgrade process, check the taxonomic updates help page and the taxonomic updates screencast.
Version 2.0 contains 10,331 species classified in 42 orders, 226 families and 2,199 genera. This is a major update that includes revisions of the family classification as well as species taxonomy. You may notice significant revisions in orders and families based on the results of important genetic studies. Our assumptions and hypotheses about avian systematics are undergoing major revisions as more information becomes available. Among other changes, the list now includes more than 200 recently split and newly described species, revisions of the Old World Warbler families, and a resequencing of suboscine families to align with South American Checklist Committee classification.
You can explore further at WorldBirdNames.org.
[...] (If you’re looking for information about the upgrade to version 2.0, see Taxonomy upgrade to IOC 2.0) [...]