A bird species is not always and forever a bird species. Scientists gather
new information - and now and then one species becomes two species or
two species are lumped to become one species. Scientists disagree on lumpings
and splittings. As a result, lists of bird species may consist of
from 9200 to 10100 species of birds in the world. Another consequence of new
information is that the zoological, latin, name of a bird changes when
the bird is considered to belong to another genus than before. Another
exciting thing, not so much of consequence for birds on stamps, is
the discovery of birds new to science.
This website uses the IOC world bird list.
IOC world bird list
The IOC list is the work of Frank Gill and Minturn Wright
on behalf of the International Ornithological Congress (IOC). The list is presented on a website and is
an update to the book "BIRDS OF THE WORLD Recommended English Names" by
Frank Gill and Minturn Wright. The list is updated quarterly to reflect taxonomic progress and
favored English names.