HBW and Birdlife International Illustrated Checklist of the Birds of the World, Volume 2
Josep Del Hoyo, Nigel J Collar, David A Christie, Andrew Elliott, Lincoln D C Fishpool, Peter Boesman & Guy M Kirwan
At present (totals may change slightly before publication), volume 2 has 41 lumps and 628 splits, compared with the taxonomy presented in the HBW series.
In total, Volume 2 deals with 1 order, 138 families, 1,351 genera, 6,585 extant species, and 58 extinct species. 1012 pages.
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