Once again American Ornithological Society supplement is out (here) and once again we are looking at what is new for Costa Rica, the country from where Lifer Nature Tours lead operations and hundreds of worldwide birders keep their updated life lists. So if you are one of those, you might like to read below about what is new with the 2020 AOS supplement. The changes are quite simple for Costa Rican listers IF you only follow common English names but if you also enjoy Latin na