List of Strigiformes by population
This is a list of Strigiformes 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.
Not all Gruiformes have had their populations quantified, but species without population estimates are included in a secondary table below.
The IOC World Bird List recognizes 254 species of Strigiformes, five of which are extinct. This list follows IUCN classifications for species names and taxonomy. Where IUCN classifications differ from other ornithological authorities, alternative names and taxonomies are noted.
Some members of Strigiformes are extinct:
- Bermuda saw-whet owl, described from fossil records and explorer accounts of the bird in the 17th century.
- Laughing owl, last seen in 1914, may have been extant through 1920s.
- Mauritius scops owl or Mauritius owl, last seen in 1837; extinct by 1859. IUCN/BirdLife International place species in genus Mascarenotus.
- Réunion scops owl or Réunion owl, went extinct in the 17th century after the colonization of the island of Réunion. IUCN/BirdLife International place species in genus Mascarenotus.
- Rodrigues scops owl or Rodrigues owl, last recorded in 1726. IUCN/BirdLife International place species in genus ''Mascarenotus.''