According to this study released in December 2016, latest research does
indeed indicate at least 18,000 species. This came a surprise to me too as
I had always heard 10,000 as the approximate number.
https://www.amnh.org/about/press-center/new-study-doubles-the-estimate-of-bird-species-in-the-world
--
Gregory Luce
"I put it down. You gotta pick it up."—Thelonious Monk
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