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Note About 2020 Updates & Corrections
Although we usually release a new version of the Clements Checklist in August, unfortunately we will NOT be able to issue an update in 2020. Instead, the next release of an updated eBird/Clements Checklist will be sometime early in 2021, although the date of this release is not yet scheduled.
This delay is driven by technical considerations. The Lab’s database management systems are being overhauled throughout 2020, and we will not be able to implement any taxonomic revisions in the eBird/Clements Checklist until we complete this database work. We apologize for the delay, and we look forward to being ready to release an update again next year.
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Overview
Go directly to 2019 Updates & Corrections
This is the 14th installment of Updates and Corrections following the publication, in 2007, of the 6th edition of The Clements Checklist of Birds of the World. Because the Clements Checklist has become tightly interwoven with the taxonomy for eBird, the checklist now is referred to as the eBird/Clements Checklist. The entire checklist (including the 2019 Updates and Corrections) is available as a downloadable spreadsheet (in Excel and .csv formats). This year’s spreadsheet version is eBird/Clements Checklist v2019, and was released on 15 August 2019.
The spreadsheet contains 14 fields (data columns):
sort v2019 – Reflects the sequence of species, groups, and subspecies in eBird/Clements v2019
Clements v2019 change – A brief note to signal that a change from eBird/Clements Checklist v2018 occurred for that entry. Sometimes only a single change is made per entry; in other cases several changes are made.
text for website v2019 – Provides a fuller explanation of the change(s) from Clements Checklist v2018 that occurred for that entry. The documentations of changes in the checklist also will be reproduced (soon) on the Updates and Corrections 2019 page.
 category – Reflecting whether the entry on that line is a species; a subspecies; a monotypic group (i.e., a group that is equivalent to a single subspecies); or a polytypic group (a group composed of two or more subspecies). Thus, the total number of subspecies recognized in the eBird/Clements Checklist is the sum of all entries listed as “subspecies” and as “group (monotypic).”
 English name
 scientific name
 range
 order
 family
 extinct – an entry (1) in this column means that the species or subspecies is extinct
 extinct year – Reflects the year the species or subspecies went extinct (or, since the extinction date rarely is known with certainty, an approximation of the last year in which it was reported); “xxxx” is used when the date of extinction is not readily accessible.
sort v2018 – Reflecting the sequence of species in eBird/Clements Checklist v2018
page 6.0 – Reflecting the page number of the species in the last (sixth) print edition (2007)
Here is a brief review of the changes that are introduced in the eBird/Clements Checklist v2019:
SUMMARY STATISTICS
Species            10721
Subspecies      20452
Groups               3800
Families              248 (with 1 additional, extinct, family)
SPECIES
In this year’s updates, we have a net gain from four newly described species, which come from three different regions: Blue-throated Hillstar (Oreotrochilus cyanolaemus) is endemic to southern Ecuador, Western Square-tailed Drongo (Dicrurus occidentalis) is widespread in western sub-Saharan Africa, Cream-eyed Bulbul (Pycnonotus pseudosimplex) occurs on Borneo, and Rote Leaf Warbler (Phylloscopus rotiensis) is restricted to Rote (an island in the Lesser Sundas), Indonesia. This year we also align our treatment of extinct species with that of BirdLife International, which among the major global avian checklists has taken the most thorough evaluation of extinct bird species. We also adopt the BirdLife International policy of only including species that persisted beyond the year 1500 A.D. Thus one extinct species, Forbes’s Snipe (Coenocorypha chathamica), is deleted, but we add 47 extinct species that we previously had overlooked. Another 106 species are newly recognized in the eBird/Clements Checklist due to “splits”, while there is a loss of 20 species due to “lumps.”
As before, we update the taxonomy and nomenclature of species for North America, based largely on decisions of the North American Checklist Committee (NACC), through the Sixtieth supplement to the American Ornithological Society’s Check-list of North American Birds (July 2019). We also are current with decisions of the South American Classification Committee (SACC) through 20 June 2019.
GROUPS
eBird/Clements Checklist has adopted the concept of the group, which initially was developed by eBird, a free, global online system to manage your bird records and bird lists. A “group” is a distinctive (field identifiable) subspecies or group of subspecies. The group is not a formal taxonomic unit, but often represents a potential future split (and so groups are a valuable taxonomic tool for the savvy birder). This year, for example, almost all of the 106 splits were upgraded from a group to a species.
Our attempt at arranging subspecies into groups is incomplete with respect to Red Crossbill (Loxia curvirostra). For this species, we recognize 12 monotypic groups, but we also list eight subspecies that are not identified as groups. These “hanging” subspecies are color coded in gray in the eBird/Clements Checklist to clarify that their status with respect to groups remains unresolved. Note that in eBird we also recognize 16 call types in Red Crossbill; at least some of these eventually may prove to be equivalent to a named subspecies.
HIGHER LEVEL TAXONOMY
No new families are added this year, but two families are lumped. Cracticidae (Bellmagpies and Allies) is merged with Artamidae (Woodswallows); the combined family now is called Artamidae (Woodswallows, Bellmagpies, and Allies). And Paradoxornithidae (Parrotbills, Wrentit, and Allies) is merged into Sylviidae (Sylviid Warblers); the combined family is Sylviidae (Sylviid Warblers, Parrotbills, and Allies). The total number of extant families in the eBird/Clements Checklist therefore is 248, with an additional extinct family (Mohoidae Hawaiian Honeyeaters), for a total of 249 families.
We also extensively revise the sequence of families in the passerines, and of tyrant flycatchers and related families in the suboscines.
The 248 extant families accepted by Clements Checklist are listed below, with the names of orders in bold CAPITAL lettering, and with an additional extinct family listed in brackets. We also provide the number of families in each order (in parentheses, after the name of each order), and the number of species in each family (in parentheses, after the name of each family).
STRUTHIONIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â
1          Struthionidae                                     Ostriches (2)
RHEIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
2          Rheidae                                             Rheas (2)
TINAMIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
3          Tinamidae                                         Tinamous (46)
CASUARIIFORMESÂ (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
4          Casuariidae                                       Cassowaries and Emu (4)
APTERYGIFORMESÂ (1)Â Â Â Â Â Â Â Â Â Â Â Â Â
5          Apterygidae                                       Kiwis (5)
ANSERIFORMESÂ (3)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
6          Anhimidae                                         Screamers (3)
7          Anseranatidae                                   Magpie Goose (1)
8          Anatidae                                            Ducks, Geese, and Waterfowl (174)
GALLIFORMESÂ (5)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
9          Megapodiidae                                   Megapodes (22)
10        Cracidae                                            Guans, Chachalacas, and Curassows (54)
11        Numididae                                         Guineafowl (6)
12        Odontophoridae                                New World Quail (33)
13        Phasianidae                                       Pheasants, Grouse, and Allies (180)
PHOENICOPTERIFORMESÂ (1)Â Â Â Â Â Â Â Â Â
14        Phoenicopteridae                               Flamingos (6)
PODICIPEDIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â
15        Podicipedidae                                    Grebes (22)
COLUMBIFORMESÂ (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
16        Columbidae                                       Pigeons and Doves (348)
MESITORNITHIFORMESÂ (1) Â Â Â Â
17        Mesitornithidae                                 Mesites (3)
PTEROCLIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â
18        Pteroclidae                                        Sandgrouse (16)
OTIDIFORMESÂ (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
19        Otididae                                             Bustards (26)
MUSOPHAGIFORMESÂ (1)Â Â Â Â Â Â Â Â Â
20        Musophagidae                                   Turacos (23)
CUCULIFORMESÂ (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
21        Cuculidae                                          Cuckoos (147)
CAPRIMULGIFORMESÂ (8)Â Â Â Â Â Â Â Â
22        Podargidae                                        Frogmouths (16)
23        Caprimulgidae                                   Nightjars and Allies (98)
24        Nyctibiidae                                        Potoos (7)
25        Steatornithidae                                  Oilbird (1)
26        Aegothelidae                                     Owlet-nightjars (10)
27        Apodidae                                           Swifts (112)
28        Hemiprocnidae                                  Treeswifts (4)
29        Trochilidae                                        Hummingbirds (349)
OPISTHOCOMIFORMES Â (1)Â Â Â Â Â
30        Opisthocomidae                                Hoatzin (1)
GRUIFORMES Â (6)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
31        Sarothruridae                                     Flufftails (11)
32        Rallidae                                             Rails, Gallinules, and Coots (159)
33        Heliornithidae                                   Finfoots (3)
34        Aramidae                                           Limpkin (1)
35        Psophiidae                                         Trumpeters (3)
36        Gruidae                                             Cranes (15)
CHARADRIIFORMES Â (19)Â Â Â Â Â Â Â Â Â
37        Chionidae                                          Sheathbills (2)
38        Pluvianellidae                                   Magellanic Plover (1)
39        Burhinidae                                         Thick-knees (10)
40        Pluvianidae                                       Egyptian Plover (1)
41        Recurvirostridae                                Stilts and Avocets (9)
42        Ibidorhynchidae                                Ibisbill (1)
43        Haematopodidae                               Oystercatchers (12)
44        Charadriidae                                      Plovers and Lapwings (67)
45        Pedionomidae                                   Plains-wanderer (1)
46        Thinocoridae                                     Seedsnipes (4)
47        Rostratulidae                                     Painted-Snipes (3)
48        Jacanidae                                           Jacanas (8)
49        Scolopacidae                                     Sandpipers and Allies (96)
50        Turnicidae                                         Buttonquail (17)
51        Dromadidae                                       Crab Plover (1)
52        Glareolidae                                        Pratincoles and Coursers (17)
53        Stercorariidae                                    Skuas and Jaegers (7)
54        Alcidae                                              Auks, Murres, and Puffins (25)
55        Laridae                                              Gulls, Terns, and Skimmers (97)
EURYPYGIFORMES Â (2)Â Â Â Â Â Â Â Â Â Â Â Â Â
56        Rhynochetidae                                  Kagu (1)
57        Eurypygidae                                      Sunbittern (1)
PHAETHONTIFORMESÂ (1)Â Â Â Â Â Â Â
58        Phaethontidae                                    Tropicbirds (3)
GAVIIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
59        Gaviidae                                            Loons (5)
SPHENISCIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â
60        Spheniscidae                                     Penguins (18)
PROCELLARIIFORMESÂ (4)Â Â Â Â Â Â
61        Diomedeidae                                     Albatrosses (15)
62        Oceanitidae                                       Southern Storm-Petrels (9)
63        Hydrobatidae                                     Northern Storm-Petrels (18)
64        Procellariidae                                    Shearwaters and Petrels (96)
CICONIIFORMESÂ (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
65        Ciconiidae                                         Storks (19)
SULIFORMES Â (4)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
66        Fregatidae                                         Frigatebirds (5)
67        Sulidae                                              Boobies and Gannets (10)
68        Anhingidae                                        Anhingas (4)
69        Phalacrocoracidae                             Cormorants and Shags (40)
PELECANIFORMESÂ (5)Â Â Â Â Â Â Â Â Â Â Â Â Â Â
70        Pelecanidae                                       Pelicans (8)
71        Balaenicipitidae                                Shoebill (1)
72        Scopidae                                            Hamerkop (1)
73        Ardeidae                                            Herons, Egrets, and Bitterns (68)
74        Threskiornithidae                              Ibises and Spoonbills (36)
CATHARTIFORMES (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â
75        Cathartidae                                        New World Vultures (7)
ACCIPITRIFORMES Â (3)Â Â Â Â Â Â Â Â Â Â Â Â Â
76        Sagittariidae                                      Secretarybird (1)
77        Pandionidae                                       Osprey (1)
78        Accipitridae                                       Hawks, Eagles, and Kites (250)
STRIGIFORMESÂ (2)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
79        Tytonidae                                          Barn-Owls (18)
80        Strigidae                                            Owls (216)
COLIIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
81        Coliidae                                             Mousebirds (6)
LEPTOSOMIFORMES (1)
82        Leptosomidae                                    Cuckoo-Roller (1)
TROGONIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
83        Trogonidae                                        Trogons (43)
BUCEROTIFORMES (4)
84        Upupidae                                           Hoopoes (3)
85        Phoeniculidae                                    Woodhoopoes and Scimitarbills (8)
86        Bucorvidae                                        Ground-Hornbills (2)
87        Bucerotidae                                       Hornbills (59)
CORACIIFORMES Â (6)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
88        Todidae                                             Todies (5)
89        Momotidae                                        Motmots (14)
90        Alcedinidae                                       Kingfishers (118)
91        Meropidae                                         Bee-eaters (28)
92        Coraciidae                                         Rollers (13)
93        Brachypteraciidae                             Ground-Rollers (5)
GALBULIFORMESÂ (2)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
94        Bucconidae                                       Puffbirds (36)
95        Galbulidae                                         Jacamars (18)
PICIFORMES Â (7)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
96        Lybiidae                                            African Barbets (41)
97        Megalaimidae                                   Asian Barbets (34)
98        Capitonidae                                       New World Barbets (14)
99        Semnornithidae                                 Toucan-Barbets (2)
100      Ramphastidae                                    Toucans (36)
101      Indicatoridae                                     Honeyguides (17)
102      Picidae                                               Woodpeckers (234)
CARIAMIFORMES Â (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
103      Cariamidae                                        Seriemas (2)
FALCONIFORMESÂ (1)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
104      Falconidae                                         Falcons and Caracaras (66)
PSITTACIFORMES Â (4)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
105      Strigopidae                                        New Zealand Parrots (4)
106      Cacatuidae                                         Cockatoos (21)
107      Psittaculidae                                      Old World Parrots (189)
108      Psittacidae                                         New World and African Parrots (173)
PASSERIFORMES Â (141)Â Â Â Â Â Â Â Â Â Â Â Â Â Â
109      Acanthisittidae                                  New Zealand Wrens (4)
110      Calyptomenidae                                African and Green Broadbills (6)
111      Eurylaimidae                                     Asian and Grauer’s Broadbills (9)
112      Sapayoidae                                        Sapayoa (1)
113      Philepittidae                                      Asities (4)
114      Pittidae                                              Pittas (44)
115      Thamnophilidae                                Typical Antbirds (234)
116     Melanopareiidae                               Crescentchests (4)
117      Conopophagidae                               Gnateaters (11)
118      Grallariidae                                       Antpittas (55)
119      Rhinocryptidae                                  Tapaculos (60)
120      Formicariidae                                    Antthrushes (11)
121      Furnariidae                                        Ovenbirds and Woodcreepers (304)
122      Pipridae                                             Manakins (53)
123      Cotingidae                                         Cotingas (65)
124      Tityridae                                            Tityras and Allies (33)
125      Oxyruncidae                                      Sharpbill, Royal Flycatcher, and Allies (7)
126      Tyrannidae                                        Tyrant Flycatchers (422)
127      Menuridae                                         Lyrebirds (2)
128      Atrichornithidae                                Scrub-birds (2)
129      Ptilonorhynchidae                             Bowerbirds (27)
130      Climacteridae                                    Australasian Treecreepers (7)
131      Maluridae                                          Fairywrens (33)
132      Meliphagidae                                    Honeyeaters (187)
133      Dasyornithidae                                  Bristlebirds (3)
134      Pardalotidae                                      Pardalotes (4)
135      Acanthizidae                                     Thornbills and Allies (65)
136      Pomatostomidae                                Pseudo-Babblers (5)
137      Orthonychidae                                   Logrunners (3)
138      Cinclosomatidae                               Quail-thrushes and Jewel-babblers (12)
139      Campephagidae                                 Cuckooshrikes (89)
140      Mohouidae                                        Whiteheads (3)
141      Neosittidae                                        Sittellas (3)
142      Psophodidae                                      Whipbirds and Wedgebills (5)
143      Eulacestomatidae                              Ploughbill (1)
144      Oreoicidae                                         Australo-Papuan Bellbirds (3)
145      Falcunculidae                                    Shrike-tit (1)
146      Paramythiidae                                   Tit Berrypecker and Crested Berrypecker (2)
147      Vireonidae                                         Vireos, Shrike-Babblers, and Erpornis (63)
148      Pachycephalidae                               Whistlers and Allies (57)
149      Oriolidae                                           Old World Orioles (38)
150     Machaerirhynchidae                         Boatbills (2)
151      Artamidae                                         Woodswallows, Bellmagpies, and Allies (24)
152      Rhagologidae                                    Mottled Berryhunter (1)
153      Platysteiridae                                     Wattle-eyes and Batises (31)
154      Vangidae                                           Vangas, Helmetshrikes, and Allies (39)
155      Pityriasidae                                       Bristlehead (1)
156      Aegithinidae                                      Ioras (4)
157      Malaconotidae                                   Bushshrikes and Allies (50)
158      Rhipiduridae                                     Fantails (53)
159      Dicruridae                                         Drongos (29)
160      Paradisaeidae                                    Birds-of-Paradise (42)
161      Ifritidae                                             Ifrita (1)
162      Monarchidae                                     Monarch Flycatchers (100)
163      Corcoracidae                                     White-winged Chough and Apostlebird (2)
164      Melampittidae                                   Melampittas (2)
165      Platylophidae                                    Crested Shrikejay (1)
166      Laniidae                                            Shrikes (33)
167      Corvidae                                            Crows, Jays, and Magpies (129)
168      Cnemophilidae                                  Satinbirds (3)
169      Melanocharitidae                              Berrypeckers and Longbills (10)
170      Callaeidae                                         Wattlebirds (5)
171      Notiomystidae                                   Stitchbird (1)
172      Petroicidae                                        Australasian Robins (49)
173      Picathartidae                                     Rockfowl (2)
174      Chaetopidae                                      Rockjumpers (2)
175      Eupetidae                                          Rail-babbler (1)
176      Hyliotidae                                         Hyliotas (4)
177      Stenostiridae                                     Fairy Flycatchers (9)
178      Paridae                                              Tits, Chickadees, and Titmice (63)
179      Remizidae                                         Penduline-Tits (11)
180      Alaudidae                                          Larks (97)
181      Panuridae                                          Bearded Reedling (1)
182      Nicatoridae                                        Nicators (3)
183      Macrosphenidae                                African Warblers (21)
184      Cisticolidae                                       Cisticolas and Allies (155)
185      Acrocephalidae                                 Reed Warblers and Allies (61)
186      Locustellidae                                     Grassbirds and Allies (62)
187      Donacobiidae                                    Donacobius (1)
188      Bernieridae                                        Malagasy Warblers (11)
189      Pnoepygidae                                      Cupwings (5)
190      Hirundinidae                                     Swallows (86)
191      Pycnonotidae                                     Bulbuls (149)
192      Phylloscopidae                                  Leaf Warblers (77)
193      Scotocercidae                                    Bush Warblers and Allies (36)
194      Aegithalidae                                      Long-tailed Tits (11)
195      Sylviidae                                           Sylviid Warblers, Parrobtills, and Allies (68)
196      Zosteropidae                                     White-eyes, Yuhinas, and Allies (136)
197      Timaliidae                                         Tree-Babblers, Scimitar-Babblers, and Allies (52)
198      Pellorneidae                                      Ground Babblers and Allies (59)
199      Leiothrichidae                                   Laughingthrushes and Allies (146)
200      Regulidae                                          Kinglets (6)
201      Tichodromidae                                  Wallcreeper (1)
202      Sittidae                                              Nuthatches (27)
203      Certhiidae                                          Treecreepers (11)
204      Polioptilidae                                      Gnatcatchers (20)
205      Troglodytidae                                    Wrens (85)
206      Elachuridae                                       Spotted Elachura (1)
207      Cinclidae                                           Dippers (5)
208      Buphagidae                                       Oxpeckers (2)
209      Sturnidae                                           Starlings (123)
210      Mimidae                                            Mockingbirds and Thrashers (34)
211      Turdidae                                            Thrushes and Allies (173)
212      Muscicapidae                                    Old World Flycatchers (322)
213      Bombycillidae                                   Waxwings (3)
214      Mohoidae                                          Hawaiian Honeyeaters (5)                       [extinct]
215      Ptiliogonatidae                                  Silky-flycatchers (4)
216      Dulidae                                              Palmchat (1)
217      Hylocitreidae                                     Hylocitrea (1)
218      Hypocoliidae                                     Hypocolius (1)
219      Promeropidae                                    Sugarbirds (2)
220      Modulatricidae                                  Dapple-throat and Allies (3)
221      Dicaeidae                                          Flowerpeckers (47)
222      Nectariniidae                                     Sunbirds and Spiderhunters (143)
223      Irenidae                                             Fairy-bluebirds (2)
224      Chloropseidae                                   Leafbirds (11)
225      Peucedramidae                                  Olive Warbler (1)
226      Urocynchramidae                              Przevalski’s Pinktail (1)
227      Ploceidae                                           Weavers and Allies (118)
228      Estrildidae                                         Waxbills and Allies (139)
229      Viduidae                                            Indigobirds (20)
230      Prunellidae                                        Accentors (13)
231      Passeridae                                         Old World Sparrows (43)
232      Motacillidae                                      Wagtails and Pipits (66)
233      Fringillidae                                        Finches, Euphonias, and Allies (227)
234      Calcariidae                                        Longspurs and Snow Buntings (6)
235      Rhodinocichlidae                              Thrush-Tanager (1)
236      Emberizidae                                      Old World Buntings (44)
237      Passerellidae                                     New World Sparrows (131)
238      Calyptophilidae                                 Chat-Tanagers (2)
239      Phaenicophilidae                               Hispaniolan Tanagers (4)
240      Nesospingidae                                   Puerto Rican Tanager (1)
241      Spindalidae                                       Spindalises (4)
242      Zeledoniidae                                     Wrenthrush (1)
243      Teretistridae                                      Cuban Warblers (2)
244      Icteriidae                                           Yellow-breasted Chat (1)
245      Icteridae                                            Troupials and Allies (105)
246      Parulidae                                           New World Warblers (110)
247      Mitrospingidae                                  Mitrospingid Tanagers (4)
248      Cardinalidae                                      Cardinals and Allies (49)
249      Thraupidae                                        Tanagers and Allies (377)
FUTURE UPDATES
The next annual revision that incorporates revisions to the taxonomy and nomenclature of the eBird/Clements Checklist will be released in August 2020.
ACKNOWLEDGEMENTS
Please continue to report potential errors, corrections and suggestions for improvement to eBird/Clements Checklist (please send taxonomic changes, suggestions, or questions to cornellbirds@cornell.edu). Many of the errors that you find are ones that would have taken a long time to notice, so we appreciate your help, and we do want to hear from you. Please keep in mind, of course, that the easiest corrections or proposed revisions are ones that are accompanied by a supporting reference or citation.
Denis Lepage, who administers Avibase, carefully reviewed our files, made useful comparisons with other taxonomies, pointed out errors, and helped with many taxonomic issues through this process; we are extremely grateful for his generous assistance. We are excited to be working with a team of representatives from other global checklists to minimize differences between the lists and to coordinate on taxonomic revisions and nomenclatural issues. As part of these efforts, we especially wish to thank Nigel Collar, David Donsker, and Frank Gill, each of whom contributed valuable insights and served as a sounding board on many issues related to taxonomy and nomenclature. We take full responsibility, of course, for any remaining errors. We are grateful to Terry Chesser for providing advance copies of works in progress, and to both Terry and to Van Remsen for their too-little appreciated roles in chairing regional classification committees.
We also thank the following for their help in providing helpful comments on the eBird/Clements Checklist or for directing us to important literature for our consideration:
Roger Ahlman, Nicholas Allen, Per Alström, Christopher Amano-Langtree, Nick Athanas, Mike Burrell, John Carlson, Jacob Cooper, Andrew Cubbon, Terry Doyle, Pete Dunten, Kimball Garrett, Jeff Gerbracht, Mat and Cathy Gilfedder, Alan Grenon, Paul Hilder, Rich Hoyer, Arco Huang, Praveen J, Oscar Johnson, Alan Johnston, Max Kirsch, Dan Lane, Niels Larsen, Jack Levene, Bernard Master, Jay McGowan, Fernando Medrano, Glenn Mertz, Nial Moores, Joe Morlan, Peter Nichols, Dave Nutter, Yoav Perlman, Colin Richardson, Dave Sargeant, Holger Schritt, Ross Silcock, Eric Tull, Wich’yanan Limparungpatthanakij, and Adam Winer, as well as the wider community of eBird users, the always astute members of the Taxonomy and Nomenclature group on BirdForum, and no doubt others who we inadvertently may have overlooked.
Thanks to all for your support, and we look forward to your feedback.
Thomas S. Schulenberg, Marshall J. Iliff, Shawn M. Billerman, Brian L. Sullivan, Christopher L. Wood, and Thomas A. Fredericks.