List of Podicipediformes by population
This is a list of Podicipediformes 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 23 species of Podicipediformes, three of which are extinct. IUCN/BirdLife International have assessed and quantified population sizes for 22 of these species, excepting tricolored grebe. Additionally, IUCN/BirdLife International recognize a split in silvery grebe into northern and southern species.
There are three species listed as members of Podicipediformes which are extinct. They are as follows:
- Alaotra grebe - declared extinct in 2010, but last sighted in 1985.
- Atitlán grebe - species declared extinct in 1986, following rapid decline.
- Colombian grebe - last confirmed sighting in 1977.