How many bird species are there?
More than 8,669.
There are roughly 8,669 bird species that have been identified and classified as of 2008. This is according to a 2008 book, A Phylogenomic Study of Birds Reveals Their Evolutionary History. This number does not include newly discovered bird species as well as species that do not fall into any taxonomic category. It is estimated that there are in total about 10,000 bird species worldwide.