List of birds by population

The average global population of all mature birds is estimated to be on the order of 100 billion individuals.

[1][2][3] The total population including younglings is somewhat higher during the breeding season of each species.

For example, the spectacled flowerpecker was only discovered in 2010, and did not receive its scientific name (Dicaeum dayakorum) until 2019,[4] adding to the other 73 new bird species described by ornithologists from 2000 – 2009.

An estimate of 250 shore dotterels compared with 4,500 – 5,000 wrybills, on the other hand, means that the latter has well over one order of magnitude more individuals than the former.

[10][11] The wrybill only has approximately one tenth the population of great skuas (48,000), which are outnumbered ~10:1 by the pigeon guillemot (470,000).