Current thinking divides the albatrosses into four genera. The number of species is a matter of debate. The IUCN and BirdLife International recognise 22 extant species (listed below),[56] ITIS recognise 21 (the 22 below minus T. steadi),[57] and one recent paper proposed a reduction to 13 (indicated in parentheses below), comprising the traditional 14 species minus D. amsterdamensis