When I first observed these birds worldwide

These are only birds I've seen or heard myself, sorted from newest to oldest observations. A total of 227 species is included, 226 of them have been observed.
There are about 11,000 species of birds in the world, so this is just the start! By country first seen that's: Switzerland 146, United States of America 39, Spain 23, Costa Rica 8, Italy 3, Portugal 3, Thailand 2, Mexico 1, Panama 1.