Passerine

A passerine (/ˈpæsəraɪn/) is any bird of the order Passeriformes (/ˈpæsərɪfɔːrmiːz/; from Latin passer 'sparrow' and formis '-shaped'), which includes more than half of all bird species. Sometimes known as perching birds, passerines generally have an anisodactyl arrangement of their toes (three pointing forward and one back), which facilitates perching.

With more than 140 families and some 6,500 identified species, Passeriformes is the largest order of birds and one of the most diverse clades of terrestrial vertebrates, representing 60% of birds. Passerines are divided into three suborders: New Zealand wrens; Suboscines, primarily found in North and South America; and songbirds. Passerines originated in the Southern Hemisphere around 60 million years ago.

Most passerines are insectivorous or omnivorous, and eat both insects and fruit or seeds.

Etymology

The terms "passerine" and "Passeriformes" are derived from the scientific name of the house sparrow, Passer domesticus, whose genus is the Latin word for sparrow. Formerly this meant the songbirds of Europe; now it also includes perching, non-singing birds from the Americas.

Description

The order is divided into three suborders, Tyranni (non-singing, Americas), Passeri (songbirds or oscines), and the basal New Zealand wrens. 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 mimics. The New Zealand wrens are tiny birds restricted to New Zealand, at least in modern times; they were long placed in Passeri.

Most passerines are smaller than typical members of other avian orders. The heaviest and altogether largest passerines are the thick-billed raven and the larger races of common raven, each exceeding 1.5 kg (3.3 lb) and 70 cm (28 in). The superb lyrebird and some birds-of-paradise, due to very long tails or tail coverts, are longer overall. The smallest passerine is the short-tailed pygmy tyrant, at 6.5 cm (2.6 in) and 4.2 g (0.15 oz).

Anatomy

The foot of a passerine has three toes directed forward and one toe directed backward, called anisodactyl arrangement. The hind toe (hallux) is long and joins the leg at approximately the same level as the front toes. This arrangement enables passerine birds to easily perch upright on branches. The toes have no webbing or joining, but in some cotingas, the second and third toes are united at their basal third.

The leg of passerine birds contains an additional special adaptation for perching. A tendon in the rear of the leg running from the underside of the toes to the muscle behind the tibiotarsus will automatically be pulled and tighten when the leg bends, causing the foot to curl and become stiff when the bird lands on a branch. This enables passerines to sleep while perching without falling off.

Most passerine birds have 12 tail feathers but the superb lyrebird has 16, and several spinetails in the family Furnariidae have 10, 8, or even 6, as is the case of Des Murs's wiretail. Species adapted to tree trunk climbing such as treecreepers and woodcreeper have stiff tail feathers that are used as props during climbing. Extremely long tails used as sexual ornaments are shown by species in different families. A well-known example is the long-tailed widowbird.

Eggs and nests

The chicks of passerines are altricial: blind, featherless, and helpless when hatched from their eggs. Hence, the chicks require extensive parental care. Most passerines lay colored eggs, in contrast with nonpasserines, most of whose eggs are white except in some ground-nesting groups such as Charadriiformes and nightjars, where camouflage is necessary, and in some parasitic cuckoos, which match the passerine host's egg. The vinous-throated parrotbill has two egg colors, white and blue, to deter the brood parasitic common cuckoo.

Clutches vary considerably in size: some larger passerines of Australia such as lyrebirds and scrub-robins lay only a single egg, most smaller passerines in warmer climates lay between two and five, while in the higher latitudes of the Northern Hemisphere, hole-nesting species like tits can lay up to a dozen and other species around five or six. The family Viduidae do not build their own nests, instead, they lay eggs in other birds' nests.[citation needed]

The Passeriformes contain several groups of brood parasites such as the viduas, cuckoo-finches, and the cowbirds.

Bird nest construction is complex and cognitively demanding, and has a very high degree of diversification amongst Passeriformes. A study of brain size and nest construction across a large number of different passerine species indicated that building nests with different attachment modes requires different levels of cognitive abilities.

Origin and evolution

The evolutionary history of the passerine families and the relationships among them remained rather mysterious until the late 20th century. In many cases, passerine families were grouped together on the basis of morphological similarities that, it is now believed, are the result of convergent evolution, not a close genetic relationship. For example, the wrens of the Americas and Eurasia, those of Australia, and those of New Zealand look superficially similar and behave in similar ways, 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.

Advances in molecular biology and improved paleobiogeographical data gradually are revealing a clearer picture of passerine origins and evolution that reconciles molecular affinities, the constraints of morphology, and the specifics of the fossil record. The first passerines are now thought to have evolved in the Southern Hemisphere in the late Paleocene or early Eocene, around 50 million years ago.

The initial diversification of passerines coincides with the separation of the southern continents in the early Eocene. The New Zealand wrens are the first to become isolated in Zealandia, and the second split involved the origin of the Tyranni in South America and the Passeri in the Australian continent. The Passeri experienced a great radiation of forms in Australia. A major branch of the Passeri, the parvorder Passerida, dispersed into Eurasia and Africa about 40 million years ago, where they experienced further radiation of new lineages. This eventually led to three major Passerida lineages comprising about 4,000 species, which in addition to the Corvida and numerous minor lineages make up songbird diversity today. Extensive biogeographical mixing happens, with northern forms returning to the south, southern forms moving north, and so on.

Fossil record

Earliest passerines

Perching bird osteology, especially of the limb bones, is rather diagnostic. However, the early fossil record is poor because passerines are relatively small, and their delicate bones do not preserve well. Queensland Museum specimens F20688 (carpometacarpus) and F24685 (tibiotarsus) from Murgon, Queensland, are fossil bone fragments initially assigned to Passeriformes. However, the material is too fragmentary and their affinities have been questioned. Several more recent fossils from the Oligocene of Europe, such as Wieslochia, Jamna, Resoviaornis, and Crosnoornis, are more complete and definitely represent early passeriforms, and have been found to belong to a variety of modern and extinct lineages.

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 ( to Lillburnian, 19–16 mya).

Early European passerines

In Europe, perching birds are not too uncommon in the fossil record from the Oligocene onward, belonging to several lineages:

• Wieslochia (Early Oligocene of Frauenweiler, Germany) – suboscine
• Resoviaornis (Early Oligocene of Wola Rafałowska, Poland) – oscine
• Jamna (Early Oligocene of Jamna Dolna, Poland) – basal
• Winnicavis (Early Oligocene of Lower Silesian Voivodeship, Poland)
• Crosnoornis (Early Oligocene of Poland) - suboscine
• 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 Mátraszőlős, Hungary) – at least 2 taxa, possibly 3; at least one probably Oscines.
• Passeriformes gen. et sp. indet. (Middle Miocene of Felsőtárkány, Hungary) – oscine?
• Passeriformes gen. et sp. indet. (Late Miocene of Polgárdi, Hungary) – Sylvioidea (Sylviidae? Cettiidae?)

That suboscines expanded much beyond their region of origin is proven by several fossils from Germany such as a presumed broadbill (Eurylaimidae) humerus fragment from the Early Miocene (roughly 20 mya) of Wintershof, Germany, the Late Oligocene carpometacarpus from France listed above, and Wieslochia, among others. Extant Passeri super-families 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 onward 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.

American fossils

In the Americas, the fossil record is more scant before the Pleistocene, from which several still-existing 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, United States: the Palaeoscinidae with the single genus Palaeoscinis. "Palaeostruthus" eurius (Pliocene of Florida) probably belongs to an extant family, most likely passeroidean.

Systematics and taxonomy

The Passeriformes is currently divided into three suborders: Acanthisitti (New Zealand wrens), Tyranni, (suboscines) and Passeri (oscines or songbirds). The Passeri is now subdivided into two major groups recognized now as Corvides and Passerida respectively containing the large superfamilies Corvoidea and Meliphagoidea, as well as minor lineages, and the superfamilies Sylvioidea, Muscicapoidea, and Passeroidea but this arrangement has been found to be oversimplified. Since the mid-2000s, studies have investigated the phylogeny of the Passeriformes and found that many families from Australasia traditionally included in the Corvoidea actually represent more basal lineages within oscines. Likewise, the traditional three-superfamily arrangement within the Passeri has turned out to be far more complex and will require changes in classification.[citation needed]

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 lineages, so new families had to be established, some of these – like the stitchbird of New Zealand and the Eurasian bearded reedling – monotypic with only one living species. 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 theirs have been found among comprehensive studies of the living Passeri, though they might be fairly close to some little-studied tropical Asian groups. Nuthatches, wrens, and their closest relatives are currently grouped in a distinct super-family Certhioidea.

Taxonomic list of Passeriformes families

This list is in taxonomic order, placing related families next to one another. The families listed are those recognised by the International Ornithologists' Union (IOC). The order and the division into infraorders, parvorders, and superfamilies follows the phylogenetic analysis published by Carl Oliveros and colleagues in 2019. The relationships between the families in the suborder Tyranni (suboscines) were all well determined but some of the nodes in Passeri (oscines or songbirds) were unclear owing to the rapid splitting of the lineages.

Suborder Acanthisitti

Acanthisittidae: New Zealand wrens

Suborder Tyranni (suboscines)

• Infraorder Eurylaimides: Old World suboscines and sapayoa

Philepittidae: asities Eurylaimidae: typical broadbills Calyptomenidae: African and green broadbills Sapayoidae: sapayoa Pittidae: pittas

• Infraorder Tyrannides: New World suboscines

Parvorder Furnariida Melanopareiidae: crescentchests Conopophagidae: gnateaters and gnatpittas Thamnophilidae: antbirds Grallariidae: antpittas Rhinocryptidae: typical tapaculos Formicariidae: antthrushes Furnariidae: ovenbirds and woodcreepers Parvorder Tyrannida Pipridae: manakins Cotingidae: cotingas Tityridae: tityras, becards and allies Oxyruncidae: sharpbill Onychorhynchidae: royal flycatchers and allies Tyrannidae: tyrant flycatchers

Suborder Passeri (oscines or songbirds)

• Infraorder Menurides

Atrichornithidae: scrub-birds Menuridae: lyrebirds

• Infraorder Climacterides

Climacteridae: Australian treecreepers Ptilonorhynchidae: bowerbirds

• Infraorder Orthonynchides

Pomatostomidae: pseudo-babblers Orthonychidae: logrunners

• Infraorder Meliphagides

Superfamily Meliphagoidea Acanthizidae: scrubwrens, thornbills, and gerygones Meliphagidae: honeyeaters Maluridae: australasian wrens Dasyornithidae: bristlebirds Pardalotidae: pardalotes

• Infraorder Corvides – previously known as the parvorder Corvida

No superfamily Cinclosomatidae: jewel-babblers, quail-thrushes Campephagidae: cuckooshrikes and trillers Mohouidae: whiteheads Neosittidae: sittellas Superfamily Orioloidea Psophodidae: whipbirds Eulacestomatidae: wattled ploughbill Falcunculidae: shriketits Oreoicidae: Australo-Papuan bellbirds Paramythiidae: painted berrypeckers Vireonidae: vireos, shrike-babblers, and erpornis Pachycephalidae: whistlers Oriolidae: Old World orioles and figbirds Superfamily Malaconotoidea

Machaerirhynchidae: boatbills Artamidae: woodswallows, butcherbirds, currawongs, and Australian magpie Rhagologidae: mottled berryhunter Malaconotidae: puffbacks, bushshrikes, tchagras, and boubous Pityriaseidae: Bornean bristlehead Aegithinidae: ioras Platysteiridae: wattle-eyes and batises Vangidae: vangas, helmetshrikes, and woodshrikes Superfamily Corvoidea Rhipiduridae: fantails Dicruridae: drongos Monarchidae: monarch flycatchers Ifritidae: blue-capped ifrit Paradisaeidae: birds-of-paradise Corcoracidae: white-winged chough and apostlebird Melampittidae: melampittas Laniidae: shrikes Platylophidae: crested jayshrike Corvidae: crows, ravens, and jays

• Infraorder Passerides – previously known as the parvorder Passerida

No parvorder Cnemophilidae: satinbirds Melanocharitidae: berrypeckers and longbills Callaeidae: New Zealand wattlebirds Notiomystidae: stitchbird Petroicidae: Australasian robins Eupetidae: rail-babbler Picathartidae: rockfowl Chaetopidae: rock-jumpers

Parvorder Sylviida – previously known as the superfamily Sylviodea Hyliotidae: hyliotas Stenostiridae: fairy flycatchers Paridae: tits, chickadees and titmice Remizidae: penduline-tits Panuridae: bearded reedling Alaudidae: larks Nicatoridae: nicators Macrosphenidae: crombecs and African warblers Cisticolidae: cisticolas and allies

Superfamily Locustelloidea Acrocephalidae: reed warblers, Grauer's warbler and allies Locustellidae: grassbirds and allies Donacobiidae: black-capped donacobius Bernieridae: Malagasy warblers Superfamily Hirundinoidea Pnoepygidae: wren-babblers Hirundinidae: swallows and martins

Superfamily Sylvioidea Pycnonotidae: bulbuls Sylviidae: sylviid warblers Paradoxornithidae: parrotbills, fulvettas, wrentit, and myzornis Zosteropidae: white-eyes and yuhinas Timaliidae: tree babblers Leiothrichidae: laughingthrushes and allies Alcippeidae: Alcippe fulvettas Pellorneidae: ground babblers

Superfamily Aegithaloidea Phylloscopidae: leaf-warblers and allies Hyliidae: hylias Aegithalidae: long-tailed tits or bushtits Scotocercidae: streaked scrub warbler Cettiidae: Cettia bush warblers and allies Erythrocercidae: yellow flycatchers

Parvorder Muscicapida – previously treated as superfamily Muscicapoidea Superfamily Bombycilloidea Dulidae: palmchat Bombycillidae: waxwings Ptiliogonatidae: silky flycatchers Hylocitreidae: hylocitrea Hypocoliidae: hypocolius †Mohoidae: Hawaiian honeyeaters

Superfamily Muscicapoidea Elachuridae: spotted elachura Cinclidae: dippers Muscicapidae: Old World flycatchers and chats Turdidae: thrushes and allies Buphagidae: oxpeckers Sturnidae: starlings, mynas, and rhabdornis Mimidae: mockingbirds and thrashers Superfamily Reguloidea Regulidae: goldcrests and kinglets Superfamily Certhioidea Tichodromidae: wallcreeper Sittidae: nuthatches Certhiidae: treecreepers Salpornithidae: spotted creepers Polioptilidae: gnatcatchers Troglodytidae: wrens Parvorder Passerida – previously known as the superfamily Passeroidea No superfamily Promeropidae: sugarbirds Modulatricidae: dapple-throat and allies Nectariniidae: sunbirds Dicaeidae: flowerpeckers Chloropseidae: leafbirds Irenidae: fairy-bluebirds Peucedramidae: olive warbler Urocynchramidae: Przewalski's finch Superfamily Ploceoidea Ploceidae: weavers Viduidae: indigobirds and whydahs Estrildidae: waxbills, munias and allies Superfamily Passeroidea Prunellidae: accentors Passeridae: Old World sparrows, snowfinches, and ibon Motacillidae: wagtails and pipits Superfamily Fringilloidea – previously known as the nine-primaried oscines Fringillidae: finches and euphonias Rhodinocichlidae: rosy thrush-tanager Calcariidae: longspurs and snow buntings Emberizidae: buntings Cardinalidae: cardinals Mitrospingidae: mitrospingid tanagers Thraupidae: tanagers and allies Passerellidae: New World sparrows, bush tanagers Parulidae: New World warblers Icteriidae: yellow-breasted chat Icteridae: grackles, New World blackbirds, and New World orioles Calyptophilidae: chat-tanagers Zeledoniidae: wrenthrush Teretistridae: Cuban warblers Nesospingidae: Puerto Rican tanager Spindalidae: spindalises Phaenicophilidae: Hispaniolan tanagers

Phylogeny

Relationships between living Passeriformes families based on the phylogenetic analysis of Oliveros et al. (2019). Some terminals have been renamed to reflect families recognised by the IOC but not in that study. The IOC families Alcippeidae and Teretistridae were not sampled in this study.

Explanatory notes

Further reading

• Alström, Per; Ericson, Per G.P.; Olsson, Urban; Sundberg, Per (February 2006). "Phylogeny and classification of the avian superfamily Sylvioidea". Molecular Phylogenetics and Evolution. 38 (2): 381–397. Bibcode:. doi:. PMID .
• Barker, F. Keith; Barrowclough, George F.; Groth, Jeff G. (7 February 2002). . Proceedings of the Royal Society of London. Series B: Biological Sciences. 269 (1488): 295–308. doi:. PMC . PMID .
• Barker, F. Keith; Cibois, Alice; Schikler, Peter; Feinstein, Julie; Cracraft, Joel (27 July 2004). . Proceedings of the National Academy of Sciences. 101 (30): 11040–11045. Bibcode:. doi:. PMC . PMID .
• Beresford, P; Barker, F.K; Ryan, P.G; Crowe, T.M (22 April 2005). . Proceedings of the Royal Society B: Biological Sciences. 272 (1565): 849–858. Bibcode:. doi:. PMC . PMID .
• Cibois, Alice; Slikas, Beth; Schulenberg, Thomas S.; Pasquet, Eric (2001). "An endemic radiation of Malagasy songbirds is revealed by mitochondrial DNA sequence data". Evolution. 55 (6): 1198–1306. doi:. PMID .
• Ericson, Per G.P.; Johansson, Ulf S. (October 2003). "Phylogeny of Passerida (Aves: Passeriformes) based on nuclear and mitochondrial sequence data". Molecular Phylogenetics and Evolution. 29 (1): 126–138. Bibcode:. doi:. PMID .
• Johansson, Ulf S.; Ericson, Per G. P. (June 2003). "Molecular support for a sister group relationship between Pici and Galbulae (Piciformes sensu Wetmore 1960)". Journal of Avian Biology. 34 (2): 185–197. Bibcode:. doi:.
• Jønsson, Knud A.; Fjeldså, Jon (March 2006). "A phylogenetic supertree of oscine passerine birds (Aves: Passeri)". Zoologica Scripta. 35 (2): 149–186. doi:.
• Lovette, Irby J.; Bermingham, Eldredge (October 2000). . Molecular Biology and Evolution. 17 (10): 1569–1577. doi:. PMID .
• Raikow, Robert J. (1982). "Monophyly of the Passeriformes: Test of a Phylogenetic Hypothesis". The Auk. 99 (3): 431–445. JSTOR .

External links

• The dictionary definition of passerine at Wiktionary
• Media related to Passeriformes at Wikimedia Commons
• Data related to Passeriformes at Wikispecies