Why lists of worldwide bird species disagree

PHYSorg
Apr 7, 2021, 3:50 pm834 ptsInteresting
How many species of birds are there in the world? It depends on whose count you go by. The number could be as low as 10,000 or as high as 18,000. It's tough to standardize lists of species because the concept of a "species" itself is a little bit fuzzy.

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