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| House Sparrow (Passer domesticus)|
House Sparrow (Passer domesticus)
|Roughly 100 families, around 5,400 species|
| Fringilla domestica|
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A passerine is a bird of the order Passeriformes, which includes more than half of all bird species. Sometimes known as perching birds or, less accurately, as songbirds, the passerines form one of the most diverse terrestrial vertebrate orders: it is roughly twice as diverse as the largest of the mammal orders, the Rodentia.
The names "passerines" and "Passeriformes" are derived from Passer domesticus, the scientific name of the type species – the House Sparrow – and ultimately from the Latin term passer for true sparrows and similar small birds.
The order is divided into three suborders, Tyranni (suboscines), Passeri (oscines), and the basal Acanthisitti. Oscines have the best control of their syrinx muscles among birds, producing a wide range of songs and other vocalizations (though some of them, such as the crows, do not sound musical to human beings); some such as the Lyrebird are accomplished imitators. The Acanthisittids or New Zealand wrens are tiny birds restricted to New Zealand, at least in modern times; They were long placed in Passeri; their taxonomic position is uncertain, though they seem to be a distinct and very ancient group.
Most passerines are smaller than typical members of other avian orders. The heaviest and altogether largest passerine is the Thick-billed Raven; some Common Ravens come close in terms of size, and lyrebirds and many birds of paradise are longer overall.[verification needed] Some of the smallest passerines are the Pygmy-tyrants.
The foot of a passerine has three toes directed forward and one toe directed backwards, called anisodactyl arrangement. The toes have no webbing or joining, but in some cotingas the second and third toes are united an their basal third. The hind toe joins the leg at the same level as the front toes. In other orders of birds the toe arrangement is different.
Most passerines lay coloured eggs, in contrast with non-passerines, whose eggs are white except in some ground-nesting groups such as Charadriiformes and nightjars, where camouflage is necessary, and some parasitic cuckoos, which match the passerine host's egg.
Origin and evolutionEdit
The evolutionary history of and relationships among the passerine families remained rather mysterious until around the end of the 20th century. Many passerine families were grouped together on the basis of morphological similarities that, it is now believed[How to reference and link to summary or text], are the result of convergent evolution, not a close genetic relationship. For example, the "wrens" of the northern hemisphere, those of Australia, and those of New Zealand look very similar and behave in similar ways, and yet belong to three far-flung branches of the passerine family tree; they are as unrelated as it is possible to be while remaining Passeriformes.
Much research remains to be done, but advances in molecular biology and improved paleobiogeographical data are gradually revealing a clearer picture of passerine origins and evolution. It is now thought that the first passerines evolved in Gondwana at some time in the Paleogene, maybe around the Late Paleocene some 60–55 million years ago (mya)[How to reference and link to summary or text]. The initial split was between the Tyranni, the songbirds, the Eurylaimides and the New Zealand "wrens", which must have diverged during a short period of time (some million years at most). The Passeriformes apparently evolved out of a fairly close-knit clade of "near passerines" which contains such birds as the Piciformes and Coraciiformes.
A little later, a great radiation of forms took place out of Australia-New Guinea: the Passeri or songbirds. A major branch of the Passeri, "Parvorder Passerida", emerged either as the sister group to the basal lineages and corvoids ("Parvorder Corvida"), or more likely as a subgroup of it, and expanded deep into Eurasia and Africa, where there was a further explosive radiation of new lineages. This eventually led to three major passeridan lineages comprising about 4,000 species, which in addition to the corvoidan clade and numerous minor lineages make up songbird diversity today. There has been extensive biogeographical mixing, with northern forms returning to the south, southern forms moving north, and so on.
Perching bird osteology, especially of the limb bones, is rather diagnostic. However, the early fossil record is poor because the first Passeriformes were apparently on the small side of the present size range, and their delicate bones did not preserve well. QM specimens F20688 (carpometacarpus) and F24685 (tibiotarsus) from Murgon, Queensland are fossil bone fragments clearly recognizable as passeriform; they represent two species of approximately some 10 and some 20 cm in overall length and prove that some 55 mya, barely into the Early Eocene, early perching birds were recognizably distinct. A quite similar group, the Zygodactylidae (named for their zygodactylous approach to perching) independently arose at much the same time – and possibly from closely related ancestors – in the landmasses bordering the North Atlantic, which at that time was only some two-thirds of its present width.
Until the discovery of the Australian fossils, it was believed for some time that Palaeospiza bella from the Priabonian Florissant Fossil Beds (Late Eocene, around 35 mya) was the oldest known passeriform. However, it is now considered a non-passeriform near passerine.
From the Bathans Formation at the Manuherikia River in Otago, New Zealand, MNZ S42815 (a distal right tarsometatarsus of a Tui-sized bird) and several bones of at least one species of Saddleback-sized bird have recently been described. These date from the Early to Middle Miocene (Awamoan to Lillburnian, 19-16 million years ago).
Modern knowledge about the living passerines' interrelationships (see the list of families below) suggests that the last common ancestor of all living Passeriformes was a small forest bird, probably with a stubby tail and an overall drab coloration, but possibly with marked sexual dimorphism. The latter trait seems to have been lost and re-evolved multiple times in songbird evolution alone, judging from its distribution among the extant lineages: the common ancestor of Passerida for example was almost certainly not markedly dimorphic considering the trait is very rare among the basal lineages of these, but very common among the youngest passerid clade, the Passeroidea; on the other hand among the basalmost Passeri there are a considerable number of strongly dimorphic lineages such as the very ancient Menuridae as well as many Meliphagoidea and Corvoidea. Sexual dimorphism is also not uncommon in the Acanthisittidae and prominent in some suboscines such as the Pipridae and Cotingidae.
Early European passerines
In Europe, perching birds are not too uncommon in the fossil record from the Oligocene onwards, but most are too fragmentary for a more definite placement:
- Wieslochia (Early Oligocene of Frauenweiler, Germany)
- Passeriformes gen. et sp. indet. (Early Oligocene of Luberon, France) – suboscine or basal
- Passeriformes gen. et spp. indet. (Late Oligocene of France) – several suboscine and oscine taxa
- Passeriformes gen. et spp. indet. (Middle Miocene of France and Germany) – basal?
- Passeriformes gen. et spp. indet. (Sajóvölgyi Middle Miocene of Mátraszõlõs, Hungary) – at least 2 taxa, possibly 3; at least one probably Oscines
Wieslochia was possibly not a member of any extant suborder. That not only the Passeri expanded much beyond their region of origin is proven by an undetermined broadbill (Eurylaimidae) from the Early Miocene (roughly 20 mya) of Wintershof, Germany, and the indeterminate Late Oligocene suboscine from France listed above. Even very basal Passeriformes might have been common in Europe until the Middle Miocene, some 12 mya. Extant Passeri superfamilies were quite distinct by that time and are known since about 12–13 mya when modern genera were present in the corvoidean and basal songbirds. The modern diversity of Passerida genera is known mostly from the Late Miocene onwards and into the Pliocene (about 10–2 mya). Pleistocene and early Holocene lagerstätten (<1.8 mya) yield numerous extant species, and many yield almost nothing but extant species or their chronospecies and paleosubspecies.
In the Americas, the fossil record is more scant before the Pleistocene, from which several still-existing suboscine families are documented. Apart from the indeterminable MACN-SC-1411 (Pinturas Early/Middle Miocene of Santa Cruz Province, Argentina), an extinct lineage of perching birds has been described from the Late Miocene of California, USA: the Palaeoscinidae with the single genus Paleoscinis. "Palaeostruthus" eurius (Pliocene of Florida) probably belongs to an extant family, most likely passeroidean.
- See also Late Quaternary prehistoric birds.
Systematics and taxonomyEdit
Initially[How to reference and link to summary or text], the Corvida and Passerida were classified as "parvorders" in the suborder Passeri; in accord with the usual taxonomic practice, they would probably be ranked as infraorders. As originally envisioned in the Sibley-Ahlquist taxonomy, they contained, respectively, the large superfamilies Corvoidea and Meliphagoidea as well as minor lineages, and the superfamilies Sylvioidea, Muscicapoidea and Passeroidea.
This arrangement has been found to be overly simplified by more recent research. Since the mid 2000s, literally dozens of studies are being published which try rather successfully to resolve the phylogeny of the passeriform radiation. For example, the Corvida in the traditional sense were a rather arbitrary assemblage of early and/or minor lineages of passeriform birds of Old World origin, generally from the region of Australia, New Zealand, and Wallacea. The Passeri on the other hand can be made monophyletic by moving some families about, but the "clean" three-superfamily-arrangement has turned out to be far more complex and it is uncertain whether future authors will stick to it.
Major "wastebin" families such as the Old World warblers and Old World babblers have turned out to be paraphyletic and are being rearranged. Several taxa turned out to represent highly distinct species-poor lineages and consequently new families had to be established, some of them – like the Stitchbird of New Zealand and the Eurasian Bearded Reedling – monotypic with only one living species.. It seems likely that in the Passeri alone, a number of minor lineages will eventually be recognized as distinct superfamilies. For example, the kinglets constitute a single genus with less than 10 species today, but seem to have been among the first perching bird lineages to diverge as the group spread across Eurasia. No particularly close relatives of them have been found among comprehensive studies of the living Passeri, though it is suspected that they might be fairly close to some little-studied tropical Asian groups. Treatment of the nuthatches, wrens, and their closest relatives as a distinct subfamily Certioidea is increasingly considered justified; the same might eventually apply to the titmice and their closest relatives.
This process is still continuing. Therefore, the arrangement as presented here is subject to change. However, it should take precedence over unreferenced conflicting treatments in family, genus and species articles here; see the next section for default sources.
Taxonomic list of Passeriformes familiesEdit
This list is in taxonomic order, placing related species/groups next to each other. The Passerida subdivisions are updated as needed from the default sequence of the Handbook of the Birds of the World, based on the most modern and comprehensive studies. Updates are added as necessary.
Regarding arrangement of familiesEdit
The families are sorted into a somewhat unusual sequence. This is because so many reallocations have taken place since about 2005 that a definite arrangement has not been established yet. The present sequence is an attempt to preserve as much of the traditional sequence while giving priority to adequately addressing the relationships between the families.
- Acanthisittidae: New Zealand "wrens"
- Infraorder Eurylaimides – Old World suboscines (or Broad-billed suboscines). Probably a separate suborder.
- Infraorder Tyrannides - New World suboscines
- Superfamily N.N. – "bronchophones"
- Superfamily Furnarioidea - tracheophones
Songbirds or oscines
- Basal Passeri – the most ancient true songbirds, endemic to Australia. Sometimes considered a superfamily "Menuroidea"[verification needed].
- Superfamily Meliphagoidea – mainly insectivores and nectarivores, distribution centered on Australo-Melanesian region extending into surroundings, notably the Pacific.
- Maluridae: fairy-wrens, emu-wrens and grasswrens
- Dasyornithidae: bristlebirds. Formerly in Acanthizidae.
- Acanthizidae: scrubwrens, thornbills, and gerygones
- Meliphagidae: honeyeaters
- Meliphagoidea incertae sedis
- Superfamily Corvoidea – a highly diverse group of global distribution, but most plentiful in the Australasian region and surroundings. The oldest truly globally successful group of passerines, they include among them what may well be the most intelligent and the most spectacular of the order.
- Melanocharitidae: berrypeckers and longbills. Tentatively placed here.
- Callaeidae: New Zealand wattlebirds. Tentatively placed here.
- Family N.N.: Stitchbird. Tentatively placed here.
- Cnemophilidae: satinbirds. Tentatively placed here.
- Neosittidae: sittellas
- Vireonidae: vireos
- Campephagidae: cuckoo-shrikes and trillers
- Pachycephalidae: whistlers and allies. Delimitation with regards to several proposed families and subfamilies requires thorough study.
- Oriolidae: orioles and Figbird
- Paramythiidae: Tit Berrypecker and Crested Berrypecker. Formerly in Passerida.
- Artamidae: woodswallows, butcherbirds, currawongs and Australian Magpie
- Malaconotidae: puffback shrikes, bush shrikes, tchagras and boubous
- Platysteiridae: wattle-eyes. Formerly in Passerida. Probably paraphyletic.
- Aegithinidae: ioras
- Pityriaseidae: Bornean Bristlehead. Tentatively placed here.
- Prionopidae: helmetshrikes and woodshrikes
- Vangidae: vangas
- Dicruridae: drongos
- Monarchidae: monarch flycatchers
- Rhipiduridae: fantails
- Paradisaeidae: birds of paradise
- Corcoracidae: White-winged Chough and Apostlebird
- Laniidae: shrikes
- Corvidae: crows, ravens and jays
- Corvoidea incertae sedis
- Vireolanius: shrike-vireos. Usually included in Vireonidae, possibly a monotypic family,
- Erpornis: White-bellied Erpornis. Formerly in Yuhina (Passerida: Timaliidae); possibly a monotypic family, possibly in Vireonidae
- Colluricinclidae: shrike-thrushes. Often included in Pachycephalidae but perhaps recognizable as a subfamily at least.
- Cinclosomatidae: whipbirds and allies. Contains Psophodidae but that might make it paraphyletic. At least some species belong in Pachycephalidae if Falcunculinae are not considered a distinct family.
- Falcunculidae: Shrike-tit and allies. Usually included in Pachycephalidae; might be distinct family or merged in Cinclosomatidae or Psophodidae[verification needed].
- "Pitohuidae": pitohuis. Usually included in Pachycephalidae but seem closer to Oriolidae and best considered a distinct family including Oreoica and possibly other Pachycephalidae sensu lato.
- Melampitta: melampittas. Two very puzzling birds of unclear systematics; the monophyly of the genus was long disputed. Maybe a basal offshoot of the Monarchidae, maybe a family of their own.
- Passeri (mainly "Corvida") incertae sedis
- Possible superfamily "Ptilonorhynchoidea"[verification needed] – bowerbirds and Australian treecreepers
- Possible superfamily N.N. - logrunners and pseudo-babblers
- Petroicidae: Australian robins
- Possible superfamily N.N.
- Possible monotypic superfamily Reguloidea – kinglets
- Regulidae: kinglets
- Possible monotypic superfamily N.N.
- Family N.N.: Hyliotas. Recently split from Sylviidae.
- Irenidae: fairy-bluebirds. Reguloidea? Basal to/in Passeroidea?
- Chloropseidae: leafbirds. Reguloidea? Basal to/in Passeroidea?
- Superfamily Sylvioidea – mostly insectivores, distribution centered on the Indo-Pacific region. Few occur in the Australian region and fewer still in the Americas. Usually sleek and drab birds, few have pronounced sexual dimorphism.
- Alaudidae: larks
- Hirundinidae: swallows and martins
- Phylloscopidae: leaf-warblers and allies. Recently split from Sylviidae.
- Aegithalidae: long-tailed tits or bushtits
- Cettiidae: ground-warblers and allies. Recently split from Sylviidae.
- Megaluridae: grass-warblers and allies. Recently split from Sylviidae.
- "Bernieridae": Malagasy warblers. A newly assembled family.
- Acrocephalidae: marsh- and tree-warblers. Recently split from Sylviidae.
- Pycnonotidae: bulbuls
- Cisticolidae: cisticolas and allies
- Sylviidae: "true/sylviid warblers" and parrotbills. Might be merged in Timaliidae. Monophyly needs confirmation.
- Zosteropidae: white-eyes. Probably belongs in Timaliidae.
- Timaliidae: (Old World) babblers. Monophyly needs confirmation.
- Sylvioidea incertae sedis
- "African warblers": A proposed clade, but monophyly needs confirmation. Formerly in Sylviidae.
- Donacobius: Black-capped Donacobius. Monotypic family? Tentatively placed here; possibly closest to Megaluridae. Formerly in Troglodytidae and Mimidae.
- Nicator: Relationships unresolved, monotypic family? Tentatively placed here; formerly in Pycnonotidae.
- Superfamily Muscicapoidea – mostly insectivores, near-global distribution centered on Old World tropics. One family endemic to Americas. Nearly absent (except introductions) from the Australian region. Usually rather stocky for their size, most are quite dark and dull though Sturnidae are commonly iridescent and/or colorful. Sexual dimorphism often absent, sometimes pronounced.
- Cinclidae: dippers
- Muscicapidae: Old World flycatchers and chats. Monophyly needs confirmation.
- Turdidae: thrushes and allies. Monophyly needs confirmation.
- Buphagidae: oxpeckers. Formerly usually included in Sturnidae.
- Sturnidae: starlings and possibly Philippine creepers. Placement of latter in Muscicapoidea seems good, but inclusion in Sturnidae requires confirmation; possibly distinct family Rhabdornithidae.
- Mimidae: mockingbirds and thrashers
- Superfamily Certhioidea - wrens and allies. Sometimes included in Muscicapoidea.
- Sittidae: nuthatches
- Tichodromadidae: Wallcreeper: Traditionally placed as a subfamily of the nuthatches and more rarely of the treecreepers, no study has been able to verify either placement this far. Thus it is better considered a monotypic family, at least for the time being.
- Certhiidae: treecreepers
- Salpornithidae: Spotted Creeper. Tentatively placed here; often considered a subfamily of the Certhidae.
- Troglodytidae: wrens
- Polioptilidae: gnatcatchers
- Superfamily Passeroidea – mostly herbivores including many seed-eaters, near-global distribution centered on Palearctic and Americas. Includes the Nine-primaried oscines (probably a subclade). A very high proportion of colorful and highly sexually dimorphic forms.
- Passeridae: true sparrows
- Prunellidae: accentors
- Motacillidae: wagtails and pipits
- Urocynchramidae: Przewalski's Finch. Recently split from Fringillidae; tentatively placed here.
- Estrildidae: estrildid finches (waxbills, munias, etc)
- Ploceidae: weavers
- Viduidae: indigobirds and whydahs
- Nine-primaried oscines:
- Peucedramidae: Olive Warbler
- Fringillidae: true finches and Hawaiian honeycreepers. Possibly polyphyletic.
- Icteridae: grackles, New World blackbirds, and New World orioles
- Parulidae: New World warblers
- Thraupidae: tanagers and allies
- Cardinalidae: cardinals
- Emberizidae: buntings and American sparrows
- Passeroidea incertae sedis
- Passerida incertae sedis - Rather basal Passerida, most of which seem to constitute several small but distinct lineages that could be considered superfamilies. Most occur in Asia, Africa and North America.
- Panurus: Bearded Reedling (Bearded "Tit"). Relationships enigmatic. Formerly in "Paradoxornithidae", might be included in Sylvioidea as monotypic family Panuridae or even constitute the smallest passerine superfamily.
- Possible superfamily Paroidea – titmice and allies. Might be included in Sylvioidea.
- Possible superfamily Bombycilloidea – waxwings and allies. Included in Muscicapoidea if Sittoidea/Certhioidea are not considered a distinct superfamily.
- Possible superfamily "Dicaeoidea" – sunbirds and flowerpeckers. Might be included in Passeroidea.
- Possible monotypic superfamily N.N.
- Promeropidae: sugarbirds. Might be included in Passeroidea.
- ↑ Johansson & Ericson (2003)
- ↑ See e.g. Boles (1997), Manegold et al. (2004), Mayr & Manegold (2006)
- ↑ Boles (1997)
- ↑ Worthy et al. (2007)
- ↑ The last common ancestor of all songbirds most likely had a decidedly longer tail. See del Hoyo et al. (2003, 2004).
- ↑ Specimen SMF Av 504. A flattened right hand of a passerine perhaps 10 cm long overall. If suboscine, perhaps closer to Cotingidae than to Eurylaimides: Roux (2002), Mayr & Manegold (2006)
- ↑ Huguenet et al. (2003), Mayr & Manegold (2006)
- ↑ Specimens SMF Av 487-496; SMNS 86822, 86825-86826; MNHN SA 1259–1263: tibiotarsus remains of small, possibly basal Passeriformes: Manegold et al. (2004)
- ↑ A partial coracoid of a probably Muscicapoidea, possibly Turdidae; distal tibiotarsus and tarsometatarsus of a smallish to mid-sized passerine which may be the same as the preceding; proximal ulna and tarsometatarsus of a Paridae-sized passerine: Gál et al. (1998-1999, 2000)
- ↑ Manegold et al. (2004)
- ↑ Distal right humerus, possibly suboscine: Noriega & Chiappe (1991, 1993)
- ↑ The former does not even have recognized subspecies, while the latter is one of the most singular birds alive today. Good photos of a Bearded Reedling are for example here and here.
- ↑ del Hoyo et al. (2003-)
- ↑ Lovette & Bermingham (2000), Cibois et al. (2001), Barker et al. (2002, 2004), Ericson & Johansson (2003), Beresford et al. (2005), Alström et al. (2006), Jønsson & Fjeldså (2006)
- ↑ Gill, F., Wright, M. & Donsker, D. (2008). IOC World Bird Names (version 1.6). Available at http://www.worldbirdnames.org/
- ↑ Lovette, I.J. (2008). Convergent Evolution: Raising a Family from the Dead. Current Biology. Volume 18, Issue 24, 23 December 2008, Pages R1132-R1134.
- ↑ Fleischer R.C., James H.F., and Olson S.L. (2008). Convergent Evolution of Hawaiian and Australo-Pacific Honeyeaters from Distant Songbird Ancestors. Current Biology, Volume 18, Issue 24, 1927-1931, 11 December 2008.
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