On this page you can view how changes to the IOC bird list have impacted on the contents of this ATWB eBook since its first annual edition.

The contents of this eBook have been incorporated into a compendium eBook. For the impact of IOC bird list updates from 2021 edition onwards, click here.

2019 edition -> 2020 edition     IOC bird list v 8.2 -> IOC bird list v 9.2

Non-Passerine Orders have been resequenced.

The following families have been moved to a different part of the IOC birdlist:

Family: Steatornithidae – Oilbird (Part 4 to Part 1)

Family: Nyctibiidae – Potoos (Part 4 to Part 1)

Family: Caprimulgidae – Nightjars (Part 4 to Part 1)

Family: Apodidae – Swifts (Part 4 to Part 1)

Family: Trochilidae – Hummingbirds (Part 4 to Part 1)

Family: Cuculidae – Cuckoos (Part 3 to Part 2)

Family: Columbidae – Pigeons, Doves (Part 3 to Part 2)

Family: Podicipedidae – Grebes (Part 1 to Part 2)

Family: Phoenicopteridae – Flamingos (Part 1 to Part 2)

9 Charadriiformes families (Part 2 to Part 3)

Family: Eurypygidae – Sunbittern (Part 2 to Part 3)

Family: Phaethontidae – Tropicbirds  (Part 1 to Part 3)

Family: Spheniscidae – Penguins (Part 1 to Part 3)

Family: Oceanitidae – Austral Storm Petrels (Part 1 to Part 3)

Family: Diomedeidae – Albatrosses (Part 1 to Part 3)

Family: Hydrobatidae – Northern Storm Petrels (Part 1 to Part 3)

Family: Procellariidae – Petrels, Shearwaters, Diving Petrels (Part 1 to Part 3)

Family: Ciconiidae – Storks (Part 1 to Part 3)

Family: Fregatidae – Frigatebirds (Part 1 to Part 3)

Family: Sulidae – Gannets, Boobies (Part 1 to Part 3)

Family: Phalacrocoracidae – Cormorants, Shags (Part 1 to Part 3)

Family: Anhingidae – Anhingas, Darters (Part 1 to Part 3)

Family: Threskiornithidae – Ibises, Spoonbills (Part 1 to Part 3)

Family: Ardeidae – Herons, Bitterns (Part 1 to Part 3)

Family: Pelecanidae – Pelicans (Part 1 to Part 3)

Family: Cathartidae – New World Vultures (Part 2 to Part 4)

Family: Pandionidae – Ospreys (Part 2 to Part 4)

Family: Accipitridae – Kites, Hawks, Eagles (Part 2 to Part 4)

Family: Tytonidae – Barn Owls (Part 3 to Part 4)

Family: Strigidae – Owls (Part 3 to Part 4)

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The following families have modified English names:

Family: Anatidae – Ducks, Geese, Swans

Family: Rallidae – Rails, Crakes & Coots

Family: Laridae – Gulls, Terns, Skimmers

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355/2807    White-tailed Hillstar    Urochroa bougueri

has been split into two species:

355/2807    Rufous-gaped Hillstar    Urochroa bougueri

(wc, sw Colombia, nc Ecuador)

355/280E    Green-backed Hillstar    Urochroa leucura

(sw Colombia, Ecuador, nc Peru)

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355/281E    Green-headed Hillstar    Oreotrochilus stolzmanni

(c, nc Peru, se Ecuador)

has been split from:

355/2814    Andean Hillstar    Oreotrochilus estella

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355/281P    Blue-throated Hillstar    Oreotrochilus cyanolaemus

(sc Ecuador)

is  a newly described species