IOC World Bird List.
Sibley&Monroe; AOU Checklist (7th Ed.) with supplements; Howard & Moore Checklist 3rd Ed. with Corrigenda; and additional current literature.
At present (2018) the checklist mainly follows the IOC World Bird Checklist (Gill and Donsker). At present it follows version 7.3.
Subspecies follow Handbook Birds of the World (as available), Howard & Moore Checklist 3rd Ed., and additional current literature.
Subspecies listed in alphabetical order within species.
All errors, mistakes, stupidities, misinterpretations and misunderstandings (and GOD KNOWS there are alot of them) are the sole responsibilities of Alan P. Peterson, M.D. ANYTHING of value (real or apparent) in this website unquestionably should be credited to someone else.