how many species of birds are there
<br /><br /> Splits and groupings of bird species happen regularly. It's even more common in butterflies and the taxonomy of moths is an even bigger mess! In the United States (including Hawaii) there are about 980 bird species, depending on the listing source. There are approximately 10,000 bird species in the world. This number varies by a few hundred birds, depending on which classification system you use. Clements (now run by Cornell University) lists about 9,800 bird species whereas Sibley and IOU list over 10,000 species.