List of Cuculiformes by population
This is a list of Cuculiformes 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.
This list is incomprehensive, as not all Cuculiformes have had their numbers quantified.
The IOC World Bird List recognizes 156 species of Cuculiformes, two 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 species included as members of Cuculiformes are extinct:
- Snail-eating coua, or Delalande's coua - last seen in 1834.
- St. Helena cuckoo - last seen in 1550.