Thank you, @whosee! 😊
How come many bird species flock there?
I believe it's about, first of all, 1) places to live 2) things to eat. Cities with big old parks, many gardens, and old buildings offer better conditions for the diversity of birds. Some city locations are also very beneficial - like river deltas.
A very serious guy
Yes, a super lovely bird. Species of kingfishers live all over the world, and some of them are tolerant of people, but they need places for burrows (they live in the ground), safe from people, like a steep riverbank, and water bodies with fish. I saw many in Hue, Vietnam - right in the city with traffic - they have steep riverbanks there along rivers.