I don't know how many species of birds each country has. I just know China has a number of 1184 or 1244 or 1253 bird species . Then how about other countries?
Lihu
Japan's list is only about 585 recorded species, of which 250 are breeding birds and 17 are endemic. A victim of isolation from the Asian continent.
By the way, 'ecology' is an interesting word, Lihu-- it comes from Greek oikos house + logos word. The science or study of the house we all live in.