Acknowledgments

We are grateful to Shawn Billerman, Science Editor, for his meticulous revision of the texts of version 2.0, which has resulted in a considerable improvement of the contents. Peter Pyle, Associate Editor, revised and edited the Plumages and Molts sections.

Ignacio Pino, librarian of the Museo Nacional de Ciencias Naturales (CSIC) in Madrid, María Ángeles Martín, librarian of Campus Cartuja (CSIC) in Sevilla, and Alexander Y. Sokolov, of the Belogorye Reservation, in Borisovka, Belgorod Region, Russia, provided assistance with references. We are grateful to Prof. Michael Wink, of the Institute of Molecular Pharmacology and Biotechnology, University of Heidelberg, in Heidelberg, Germany, for sending us his recent paper on flamingo phylogeny. Cornelis J. Hazevoet provided information about Greater Flamingo in the Cape Verde Islands.