BirdLife International, as the IUCN Red List Authority for birds, continually collates up-to-date information on Globally Threatened Birds from the published literature and from a worldwide network of experts. This information is used to evaluate the status of each species for the IUCN Red List of Threatened Species.

A species’ Red List status reflects the information available at the time of assessment. New information on the population or range size and trends of a species, the threats impacting it, or taxonomic changes may indicate that a species warrants uplisting or downlisting to higher or lower categories of threat. In such cases, BirdLife’s Globally Threatened Bird Forums are used to advertise the proposed change and to solicit relevant information or comment from a wide network of experts and organisations.