Innumerable people and institutions have contributed in many different ways in collecting, collating and making available to the public much of the data we have used here and therefore we would like to express our doubt of gratitude to all of them. Particularly, this research has benefited from the support of Fundacion ProAves who shared their checklist of the birds of Colombia and bird census data, Project BioMap who shared its Darwin–Hernandez Database, and Walberto Naranjo and DatAves who shared their database. Similarly, from discussions and electronic correspondence with T. Donegan, P. Salaman and O. Cortes.

A special acknowledgement to my wife Laima and my children from whom I have taken many hours to put into this Atlas during the last year.