The IOC World List has now been updated to the latest published version 10.2 from July 2020.
Of most interest to listers in Britain and Europe will be the split of Subalpine Warbler (have you seen Western or Eastern or both?!) Most American listers will have lost Northwestern Crow following its not unexpected lump with American Crow, whilst some Asian listers will be pleased that White-faced Plover is a separate species compared to Kentish Plover. Australian listers might find they now have one or two extra Grasswrens following the split of Striated.
Regional or country lists based on IOC, such as the IOC Western Palearctic list, have also been updated.
We automatically apply updates where we can, and in other cases you will be prompted for any taxonomic changes to address yourself.
If you have any queries about distributions or identification of individuals so that you know what you can count, do post in the forums so that other BUBO Listers can help out.