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 507 species is included.
There are about 11,000 species of birds in the world, so this is just the start! By country first seen that's: Switzerland 150, Mexico 67, United States of America 58, Costa Rica 46, Laos 29, Spain 27, Botswana 20, Cambodia 19, Australia 15, Panama 13, Thailand 12, Iceland 11, South Africa 9, Namibia 5, Guatemala 4, Great Britain 3, Portugal 2, Belize 2.