IOC vs. Clements (3.2 vs 6.7)


The coming version of Scythebill supports the IOC 3.2 taxonomy in addition to Clements 6.7, and will let you switch between the two taxonomies at any time.

This work makes it fairly easy to figure out the full list of splits and lumps in the IOC taxonomy, relative to Clements.  (Lists are subject to change;  they can be fooled by cases where subspecies are reassigned, for one, and are probably overlooking some more complicated cases.)


  1. Ostrich to Common/Somali Ostrich
  2. Comb Duck to Comb/Knob-billed Duck
  3. Mallard to Mallard/Mexican Duck
  4. Green-winged Teal to Eurasian/Green-winged Teal
  5. White-winged Scoter to Velvet/White-winged Scoter
  6. Ruddy Duck to Ruddy/Andean Duck
  7. Dusky Scrubfowl to Dusky Megapode/Biak Scrubfowl
  8. Speckled Chachalaca to Speckled/East Brazilian/Scaled Chachalaca
  9. Variable Chachalaca to Little/Chestnut-headed Chachalaca
  10. Horned Curassow to Horned/Sira Curassow
  11. Crested Bobwhite to Spot-bellied/Crested Bobwhite
  12. Long-billed Partridge to Long-billed/Hose's Partridge
  13. Udzungwa Partridge to Udzungwa/Rubeho Forest Partridge
  14. Gray-breasted Partridge to Malaysian/Roll's/Sumatran/Grey-breasted Partridge
  15. Chestnut-headed Partridge to Chestnut-headed/Siamese Partridge
  16. White Eared-Pheasant to White/Tibetan Eared Pheasant
  17. Ring-necked Pheasant to Common/Green Pheasant
  18. Gray Peacock-Pheasant to Grey/Hainan Peacock-Pheasant
  19. Little Grebe to Little/Tricolored Grebe
  20. Yellow-nosed Albatross to Atlantic/Indian Yellow-nosed Albatross
  21. Black-browed Albatross to Black-browed/Campbell Albatross
  22. Royal Albatross to Southern/Northern Royal Albatross
  23. Wandering Albatross to Wandering/Antipodean/Amsterdam/Tristan Albatross
  24. Herald Petrel to Herald/Trindade Petrel
  25. Fea's Petrel to Fea's/Desertas Petrel
  26. Black-capped Petrel to Black-capped/Jamaican Petrel
  27. Cory's Shearwater to Scopoli's/Cory's Shearwater
  28. Townsend's Shearwater to Townsend's/Newell's Shearwater
  29. Tropical Shearwater to Tropical/Bannerman's Shearwater
  30. Great Cormorant to Great/White-breasted Cormorant
  31. Little Egret to Little/Dimorphic Egret
  32. Cattle Egret to Western/Eastern Cattle Egret
  33. Striated Heron to Lava/Striated Heron
  34. Sacred Ibis to African/Malagasy Sacred Ibis
  35. Osprey to Western/Eastern Osprey
  36. Hook-billed Kite to Hook-billed/Cuban Kite
  37. Barred Honey-buzzard to Barred/Philippine Honey Buzzard
  38. Mountain Hawk-Eagle to Mountain/Legge's Hawk-Eagle
  39. Eastern Marsh-Harrier to Eastern Marsh/Papuan Harrier
  40. Reunion Harrier to Reunion/Malagasy Harrier
  41. Northern Harrier to Hen/Northern Harrier
  42. Sharp-shinned Hawk to Sharp-shinned/Plain-breasted/Rufous-thighed Hawk
  43. Bicolored Hawk to Bicolored/Chilean Hawk
  44. Black Kite to Black/Yellow-billed Kite
  45. Common Buzzard to Common/Eastern/Himalayan Buzzard
  46. Mountain Buzzard to Mountain/Forest Buzzard
  47. Black Rail to Black Rail/Junin Crake
  48. Virginia Rail to Virginia/Ecuadorian Rail
  49. Purple Swamphen to Purple/African Swamphen
  50. Black-necked Stilt to Black-necked/White-backed Stilt
  51. Dusky Woodcock to Javan/New Guinea Woodcock
  52. Hottentot Buttonquail to Hottentot/Black-rumped Buttonquail
  53. Herring Gull to European Herring/American Herring/Vega Gull
  54. Caspian Gull to Vega/Caspian/Lesser Black-backed Gull
  55. Sandwich Tern to Sandwich/Cabot's Tern
  56. Emerald Dove to Common/Pacific Emerald Dove
  57. Gray-headed Dove to Grey-headed/Azuero Dove
  58. Sapphire Quail-Dove to Sapphire/Indigo-crowned Quail-Dove
  59. Dark-eared Dove to Tawitawi/Mindanao Brown Dove
  60. Madagascar Green-Pigeon to Madagascar/Comoros Green Pigeon
  61. Green Imperial-Pigeon to Green/Nicobar Imperial Pigeon
  62. Torresian Imperial-Pigeon to Torresian/Yellowish Imperial Pigeon
  63. Large Hawk-Cuckoo to Large/Dark Hawk-Cuckoo
  64. Plaintive Cuckoo to Plaintive/Grey-bellied Cuckoo
  65. Brush Cuckoo to Brush/Rusty-breasted Cuckoo
  66. Asian Drongo-Cuckoo to Square-tailed/Fork-tailed/Moluccan Drongo-Cuckoo
  67. Asian Koel to Asian/Pacific Koel
  68. Yellowbill to Blue/Green Malkoha
  69. White-browed Coucal to White-browed/Burchell's Coucal
  70. African Scops-Owl to African/Socotra Scops Owl
  71. Sulawesi Scops-Owl to Sula/Siau/Sulawesi Scops Owl
  72. Vermiculated Screech-Owl to Middle American/Roraiman/Choco/Napo Screech Owl
  73. Great Horned Owl to Great/Lesser Horned Owl
  74. Northern Pygmy-Owl to Northern/Mountain/Guatemalan Pygmy Owl
  75. Barred Owl to Northern/Mexican Barred Owl
  76. Southern Boobook to Southern Boobook/Morepork
  77. Brown Hawk-Owl to Brown/Hume's Hawk-Owl
  78. Short-tailed Frogmouth to Short-tailed/Bornean Frogmouth
  79. Javan Frogmouth to Javan/Blyth's/Palawan Frogmouth
  80. Greater Antillean Nightjar to Cuban/Hispaniolan Nightjar
  81. Gray Nightjar to Jungle/Grey Nightjar
  82. Cave Swiftlet to Cave/Bornean Swiftlet
  83. White-throated Mountain-gem to White-throated/Grey-tailed Mountaingem
  84. Broad-billed Hummingbird to Broad-billed/Doubleday's Hummingbird
  85. Wedge-tailed Sabrewing to Curve-winged/Wedge-tailed Sabrewing
  86. White-vented Plumeleteer to White-vented/Bronze-tailed Plumeleteer
  87. Green-fronted Hummingbird to Green-fronted/Cinnamon-sided Hummingbird
  88. Streamertail to Red-billed/Black-billed Streamertail
  89. Blue-crowned Motmot to Blue-crowned/Blue-diademed Motmot
  90. Malachite Kingfisher to Principe/Malachite/Sao Tome Kingfisher
  91. Buff-breasted Paradise-Kingfisher to Buff-breasted/Black-capped Paradise Kingfisher
  92. Eurasian Hoopoe to Eurasian/African Hoopoe
  93. Violet Woodhoopoe to Violet/Grant's Wood Hoopoe
  94. Spot-backed Puffbird to Caatinga/Chaco Puffbird
  95. Crimson-fronted Barbet to Crimson-fronted/Malabar Barbet
  96. Emerald Toucanet to Wagler's/Emerald/Blue-throated/Violet-throated/Santa Marta/White-throated/Black-throated Toucanet
  97. Chestnut-tipped Toucanet to Chestnut-tipped/Whitely's Toucanet
  98. Collared Aracari to Collared/Stripe-billed/Pale-mandibled Aracari
  99. Ivory-billed Aracari to Ivory-billed/Brown-mandibled Aracari
  100. Channel-billed Toucan to Channel-billed/Citron-throated Toucan
  101. Golden-spangled Piculet to Golden-spangled/Black-dotted Piculet
  102. Golden-fronted Woodpecker to Golden-fronted/Velasquez's Woodpecker
  103. Philippine Woodpecker to Philippine/Sulu Pygmy Woodpecker
  104. Brown-capped Woodpecker to Sunda/Brown-capped Pygmy Woodpecker
  105. Fulvous-breasted Woodpecker to Fulvous-breasted/Freckle-breasted Woodpecker
  106. Golden-olive Woodpecker to Golden-olive/Bronze-winged Woodpecker
  107. Eurasian Kestrel to Common/Rock Kestrel
  108. Rainbow Lorikeet to Sunset/Leaf/Marigold/Coconut/Biak/Rainbow/Red-collared Lorikeet
  109. Horned Parakeet to Horned/Ouvea Parakeet
  110. Ground Parrot to Eastern/Western Ground Parrot
  111. Brown-necked Parrot to Brown-necked/Cape Parrot
  112. Green Parakeet to Green/Socorro/Red-throated Parakeet
  113. Speckle-faced Parrot to Plum-crowned/White-capped Parrot
  114. Red-lored Parrot to Red-lored/Diademed Amazon
  115. Yellow-headed Parrot to Yellow-headed/Tres Marias Amazon
  116. White-flanked Antwren to White-flanked/Silvery-flanked Antwren
  117. White-fringed Antwren to Southern/Northern White-fringed Antwren
  118. Rufous Gnateater to Rufous/Ceara Gnateater
  119. Black-faced Antthrush to Black-faced/Mayan Antthrush
  120. Red-billed Woodcreeper to Red-billed/Uniform/Brigida's Woodcreeper
  121. Ocellated Woodcreeper to Ocellated/Tschudi's Woodcreeper
  122. Buffy Tuftedcheek to Buffy/Pacific Tuftedcheek
  123. Pale-legged Hornero to Pale-legged/Pacific/Caribbean Hornero
  124. Striped Woodhaunter to Eastern/Western Woodhaunter
  125. Rufous-fronted Thornbird to Rufous-fronted/Plain Thornbird
  126. Creamy-breasted Canastero to Rusty-vented/Dark-winged/Pale-tailed Canastero
  127. Rusty-backed Spinetail to Rusty-backed/Coiba Spinetail
  128. Mouse-colored Tyrannulet to Mouse-colored/Tumbesian Tyrannulet
  129. Rough-legged Tyrannulet to Rough-legged/White-fronted Tyrannulet
  130. Paltry Tyrannulet to Paltry/Venezuelan Tyrannulet
  131. Golden-faced Tyrannulet to Golden-faced/Loja Tyrannulet
  132. Yellow-margined Flycatcher to Zimmer's/Yellow-margined Flatbill
  133. Yellow-breasted Flycatcher to Ochre-lored/Olive-faced Flatbill
  134. Royal Flycatcher to Amazonian/Northern/Pacific/Atlantic Royal Flycatcher
  135. Tropical Pewee to Tropical/Tumbes Pewee
  136. White-winged Black-Tyrant to White-winged/Sao Francisco Black Tyrant
  137. Crowned Chat-Tyrant to Crowned/Kalinowski's Chat-Tyrant
  138. Slaty-backed Chat-Tyrant to Slaty-backed/Blackish/Maroon-belted Chat-Tyrant
  139. Sirystes to Eastern/Western Sirystes
  140. Striped Manakin to Eastern/Western Striped Manakin
  141. Shrike-like Cotinga to Brazilian/Andean Laniisoma
  142. Green-backed Becard to Green-backed/Yellow-cheeked Becard
  143. Flame Bowerbird to Masked/Flame Bowerbird
  144. Thick-billed Grasswren to Western/Thick-billed Grasswren
  145. Graceful Honeyeater to Graceful/Elegant Honeyeater
  146. White-naped Honeyeater to White-naped/Swan River Honeyeater
  147. Black-faced Friarbird to Black-faced/Tanimbar Friarbird
  148. Helmeted Friarbird to Helmeted/New Guinea/Hornbill Friarbird
  149. Rufous Fieldwren to Western/Rufous Fieldwren
  150. Kokako to North/South Island Kokako
  151. Saddleback to North/South Island Saddleback
  152. Blue Jewel-babbler to Blue/Brown-headed Jewel-babbler
  153. Short-tailed Batis to Forest/Reichenow's Batis
  154. Black-headed Batis to Eastern/Western Black-headed Batis
  155. Tropical Boubou to Ethiopian/Tropical Boubou
  156. Four-colored Bushshrike to Gorgeous/Four-colored Bushshrike
  157. White-bellied Minivet to White-bellied/Jerdon's Minivet
  158. Scarlet Minivet to Orange/Scarlet Minivet
  159. Ashy Cuckooshrike to Madagascar/Comoros Cuckooshrike
  160. Common Cicadabird to Common/Palau/Yap/Pohnpei/Grey-capped Cicadabird
  161. Varied Sittella to Varied/Papuan Sittella
  162. Drab Whistler to Drab/Cinnamon-breasted Whistler
  163. Rufous-tailed Shrike to Isabelline/Red-tailed Shrike
  164. Southern Gray Shrike to Southern/Steppe Grey Shrike
  165. Thick-billed Vireo to Thick-billed/Providencia Vireo
  166. Black-headed Paradise-Flycatcher to Red-bellied/Annobon Paradise Flycatcher
  167. Black-throated Shrikebill to Black-throated/Santa Cruz Shrikebill
  168. Green Jay to Green/Inca Jay
  169. Western Scrub-Jay to California/Woodhouse's Scrub Jay
  170. Azure-winged Magpie to Azure-winged/Iberian Magpie
  171. Slender-billed Crow to Slender-billed/Violet Crow
  172. Palm Crow to Hispaniolan/Cuban Palm Crow
  173. Large-billed Crow to Large-billed/Eastern Jungle/Indian Jungle Crow
  174. Torresian Crow to Torresian/Bismarck Crow
  175. Lawes's Parotia to Lawes's/Eastern Parotia
  176. Magnificent Riflebird to Magnificent/Growling Riflebird
  177. Somali Short-toed Lark to Somali/Athi Short-toed Lark
  178. Lesser Short-toed Lark to Lesser/Asian Short-toed Lark
  179. Crested Lark to Crested/Maghreb Lark
  180. Rock Martin to Pale Crag/Rock Martin
  181. Pacific Swallow to Pacific/Hill Swallow
  182. Red-rumped Swallow to Red-rumped/West African Swallow
  183. Long-tailed Tit to Long-tailed Tit/Silver-throated Bushtit
  184. Black-browed Tit to Rufous-fronted/Black-browed/Burmese Bushtit
  185. Eurasian Nuthatch to Eurasian/Siberian Nuthatch
  186. Eurasian Treecreeper to Eurasian/Hodgson's Treecreeper
  187. Brown-throated Treecreeper to Brown-throated/Hume's Treecreeper
  188. House Wren to House/Cobb's Wren
  189. Rufous-naped Wren to Rufous-naped/Sclater's/Rufous-backed Wren
  190. Guianan Gnatcatcher to Guianan/Rio Negro/Para Gnatcatcher
  191. Shelley's Greenbul to Shelley's/Kakamega Greenbul
  192. Eastern Mountain-Greenbul to Olive-breasted/Mountain/Uluguru/Black-browed/Yellow-throated Greenbul
  193. Stripe-cheeked Greenbul to Stripe-cheeked/Olive-headed/Stripe-faced Greenbul
  194. Cabanis's Greenbul to Cabanis's/Placid Greenbul
  195. Yellow-streaked Greenbul to Yellow-streaked/Sharpe's Greenbul
  196. Common Bulbul to Common/Somali/Dodson's/Dark-capped Bulbul
  197. Ashy Bulbul to Ashy/Cinereous Bulbul
  198. Firecrest to Common/Madeira Firecrest
  199. Yellowish-bellied Bush-Warbler to Hume's/Yellow-bellied Bush Warbler
  200. Arctic Warbler to Arctic/Kamchatka Leaf/Japanese Leaf Warbler
  201. Greenish Warbler to Greenish/Two-barred Warbler
  202. Mountain Warbler to Mountain/Negros Leaf Warbler
  203. Marquesan Reed-Warbler to Northern/Southern Marquesan Reed Warbler
  204. Spotted Bush-Warbler to West Himalayan/Spotted/Baikal Bush Warbler
  205. Tawny Grassbird to Tawny/Papuan Grassbird
  206. Bar-throated Apalis to Bar-throated/Yellow-throated/Taita/Namuli Apalis
  207. Green-backed Camaroptera to Green-backed/Grey-backed/Hartert's Camaroptera
  208. Winding Cisticola to Rufous-winged/Winding/Coastal/Ethiopian/Luapula Cisticola
  209. Banded Prinia to Banded/Black-faced Prinia
  210. Subalpine Warbler to Subalpine/Moltoni's Warbler
  211. Rufous-headed Parrotbill to White-breasted/Rufous-headed Parrotbill
  212. Reed Parrotbill to Northern/Reed Parrotbill
  213. Broad-ringed White-eye to Montane/Kikuyu/Taita White-eye
  214. Cape White-eye to Cape/Orange River White-eye
  215. Mascarene White-eye to Reunion/Mauritius Grey White-eye
  216. Gray-cheeked Fulvetta to Grey-cheeked/David's/Yunnan/Huet's Fulvetta
  217. Short-tailed Scimitar-Babbler to Short-tailed/Naung Mung Scimitar Babbler
  218. Chinese Babax to Chinese/Mount Victoria Babax
  219. Common Babbler to Common/Afghan Babbler
  220. Chapin's Flycatcher to Chapin's/Itombwe Flycatcher
  221. Fire-crested Alethe to White-tailed/Fire-crested Alethe
  222. White-rumped Shama to White-rumped/White-crowned Shama
  223. Blue-throated Flycatcher to Blue-throated/Chinese Blue Flycatcher
  224. Sulawesi Blue-Flycatcher to Tanahjampea/Sulawesi Blue Flycatcher
  225. Narcissus Flycatcher to Narcissus/Green-backed Flycatcher
  226. Siberian Stonechat to Siberian/Stejneger's Stonechat
  227. African Stonechat to African/Madagascar Stonechat
  228. Mourning Wheatear to Mourning/Abyssinian/Arabian Wheatear
  229. Red-tailed Wheatear to Kurdish/Red-tailed Wheatear
  230. Scaly Thrush to White's/Amami/Scaly/Nilgiri/Sri Lanka Thrush
  231. San Cristobal Thrush to White-bellied/Guadalcanal Thrush
  232. Slaty Thrush to Andean/Eastern Slaty Thrush
  233. White-throated Thrush to White-throated/Dagua Thrush
  234. Metallic Starling to Metallic/Violet-hooded Starling
  235. Lesser Blue-eared Glossy-Starling to Lesser/Miombo Blue-eared Starling
  236. Plain-throated Sunbird to Brown-throated/Grey-throated Sunbird
  237. Eastern Double-collared Sunbird to Eastern/Usambara/Forest Double-collared Sunbird
  238. Shelley's Sunbird to Shelley's/Hofmann's Sunbird
  239. Souimanga Sunbird to Souimanga/Abbott's Sunbird
  240. Australasian Pipit to Australian/New Zealand Pipit
  241. Masked Yellowthroat to Masked/Chiriqui/Black-lored/Southern Yellowthroat
  242. Yellow Warbler to American Yellow/Mangrove Warbler
  243. Yellow-rumped Warbler to Myrtle/Audubon's/Goldman's Warbler
  244. Golden-bellied Warbler to Cuzco/Choco Warbler
  245. Black-capped Hemispingus to Black-capped/White-browed Hemispingus
  246. Black-eared Hemispingus to Black-eared/Western/Piura Hemispingus
  247. Flame-rumped Tanager to Flame-rumped/Lemon-rumped Tanager
  248. Black-faced Dacnis to Black-faced/Yellow-tufted Dacnis
  249. Nightingale Finch to Inaccessible/Nightingale Island Finch
  250. Wilkins's Finch to Inaccessible Island/Wilkins's Finch
  251. Black-and-rufous Warbling-Finch to Black-and-rufous/Black-and-chestnut Warbling Finch
  252. Tricolored Brush-Finch to Choco/Tricolored Brush Finch
  253. Prevost's Ground-Sparrow to Prevost's/Cabanis's Ground Sparrow
  254. Hepatic Tanager to Tooth-billed/Red/Hepatic Tanager
  255. Carmiol's Tanager to Carmiol's/Olive Tanager
  256. Bronzed Cowbird to Bronzed/Bronze-brown Cowbird
  257. Orchard Oriole to Orchard/Ochre Oriole
  258. Mountain Cacique to Southern/Northern Mountain Cacique
  259. Scarlet-rumped Cacique to Subtropical/Scarlet-rumped Cacique
  260. Crimson-winged Finch to Eurasian/African Crimson-winged Finch
  261. Streaky-headed Seedeater to Streaky-headed/West African Seedeater
  262. Golden-winged Grosbeak to Socotra/Arabian Golden-winged Grosbeak
  263. Apapane to Apapane/Laysan Honeycreeper
  264. Red-headed Fody to Comoros/Aldabra Fody
  265. Swee Waxbill to Swee/Angolan Waxbill
  266. Fawn-breasted Waxbill to Fawn-breasted/Abyssinian Waxbill
  267. Streak-headed Munia to Streak-headed/White-spotted Mannikin


  1. Lemon/Forest Dove to Lemon Dove
  2. Island/Philippine Collared-Dove to Island Collared Dove
  3. Port Lincoln Parrot/Mallee Ringneck to Australian Ringneck
  4. Blue-crowned/Mindoro Racquet-tail to Blue-crowned Racket-tail
  5. Seychelles Parrot/Lesser Vasa-Parrot to Lesser Vasa Parrot
  6. Pheasant/Kai Coucal to Pheasant Coucal
  7. African Barred/Chestnut Owlet to African Barred Owlet
  8. Himalayan/Indochinese Swiftlet to Himalayan Swiftlet
  9. Palawan/Uniform Swiftlet to Uniform Swiftlet
  10. Orange-bellied/Collared Trogon to Collared Trogon
  11. White-throated/Brown-breasted Kingfisher to White-throated Kingfisher
  12. Black-backed/Rufous-backed Dwarf-Kingfisher to Oriental Dwarf Kingfisher
  13. Northern/Southern Silvery-Kingfisher to Silvery Kingfisher
  14. Blue-throated/Rufous-crowned Bee-eater to Blue-throated Bee-eater
  15. Northern/Southern Sooty-Woodpecker to Sooty Woodpecker
  16. Red-bellied/Sula Pitta to Red-bellied Pitta
  17. Serra/Restinga Antwren to Serra Antwren
  18. Olivaceous/Northern/Foothill/Rufous-winged/Brown-winged Schiffornis to Thrush-like Schiffornis
  19. Archbold's/Sanford's Bowerbird to Archbold's Bowerbird
  20. Fernando Po/West African Batis to Fernando Po Batis
  21. Gray/Silver-backed Butcherbird to Grey Butcherbird
  22. Oriole/Rennell Whistler to Oriole Whistler
  23. Black-naped/Pale-blue Monarch to Black-naped Monarch
  24. White-naped/Loetoe Monarch to White-naped Monarch
  25. Sombre/Caspian Tit to Sombre Tit
  26. Willow/Songar Tit to Willow Tit
  27. Coal/Black-crested Tit to Coal Tit
  28. Great/Turkestan Tit to Great Tit
  29. Azure/Yellow-breasted Tit to Azure Tit
  30. Manchurian/Japanese Bush-Warbler to Japanese Bush Warbler
  31. Rufous-breasted/Gray-breasted Laughingthrush to Black-chinned Laughingthrush
  32. Small/Margelanic Whitethroat to Desert Whitethroat
  33. Lord Howe White-eye/Silver-eye to Silvereye
  34. Goldcrest/Canary Islands Kinglet to Goldcrest
  35. Stripe-breasted/Visayan Rhabdornis to Stripe-breasted Rhabdornis
  36. Abyssinian/Kivu Ground-Thrush to Abyssinian Ground Thrush
  37. Rufous-tailed/African Scrub-Robin to Rufous-tailed Scrub Robin
  38. White-browed/Visayan Shama to White-browed Shama
  39. Eastern/Western Olive Sunbird to Olive Sunbird
  40. House/Italian Sparrow to House Sparrow
  41. Mottled/New Hanover Munia to Hunstein's Mannikin
  42. African/Jackson's Pipit to African Pipit
  43. Black-headed/Damara Canary to Black-headed Canary
Last updated Jan. 5, 2013

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