Differences between 2019 advance and final releases
The main difference is inclusion of subspecies data.
The first two errors were mine; the third was Cornell's.
- Tristan Moorhen is extinct, so is removed, reducing the world species count by 1.
- The species Eastern Mountain-Greenbul was renamed Eastern Mountain Greenbul,
but actually only the subspecies kikuyuensis, nigriceps, and usambarae should have been renamed.
The other subspecies are split or lumped into various other species.
- Western Square-tailed Drongo was incorrectly placed in Rhipiduridae but is now in Dicruridae where it belongs.
Also, I have been strict about adhering to records committee/ABA decisions about inclusion of species
on state lists and hence the N.A. list,
but I decided to proactively add Stejneger's Scoter to the Alaska list,
since eventual acceptance should be pro-forma.
This increases the N.A. mode species count by 1.