to lumps in the last twenty years than ever before. This increase does not appear to be based exclusively on molecular data. Taxonomists are using multiple types of evidence to back their taxonomic decisions.
about what differentiates taxa which are eventually lumped and split from those which aren’t: geographical location? Original author? Size? Make our database of lumps and splits available for others to use, improve and build on.
the American Ornithologists’ Union Check-list of North American Birds. The Auk 128(3):600-613. Padial, J. M., and De la Riva, I. 2006. Taxonomic Inﬂation and the Stability of Species Lists: The Perils of Ostrich's Behavior. Systematic Biology 55 (5): 859-867 Sangster, G. 2013. The application of species criteria in avian taxonomy and its implications for the debate over species concepts. Biological Reviews, available online before publication.
commons.wikimedia.org /wiki/ File:Gallinula_galeata_sa ndvicensis_ %284737186698%29.jpg Screenshots: http://avibase.bsc- eoc.org http:// www.mappinglife.org/ Cover of Checklist of North American birds from: http://www.aou.org/ checklist/north/print.php