List of Pelecaniformes by population
This is a list of Pelecaniformes species by global population. While numbers are estimates, they have been made by the experts in their fields. For more information on how these estimates were ascertained, see Wikipedia's articles on population biology and population ecology.
The IOC World Bird List recognizes 118 species of Pelecaniformes, seven of which are extinct. As of December 2025, IUCN/BirdLife International have assessed 111 of these species. This list follows IUCN classifications for species names and taxonomy. Where IUCN classifications differ from other ornithological authorities, alternative names/taxonomic statuses are noted.
Several species listed as members of Pelecaniformes are extinct:
- Réunion ibis - last seen in 1763.
- New Zealand bittern - last seen in 1890. IUCN/BirdLife International place this bird in genus Ixobrychus.
- Bermuda night heron - last seen in 1610. Likely extinct shortly afterward.
- Ascension night heron - likely went extinct circa 1500. Not listed by IUCN/BirdLife International.
- Réunion night heron - likely went extinct in early 1700s.
- Mauritius night heron - likely went extinct in early 1700s.
- Rodrigues night heron - likely extinct circa 1761.