Passerine

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 primary clades: the suborder Tyranni (non-singing, Americas), the suborder Passeri (songbirds or oscines), and the family Acanthisittidae (New Zealand wrens, sometimes considered to constitute a suborder, Acanthisitti). Modern molecular evidence indicates that the New Zealand wrens are sister to the remaining two clades. 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 and . 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 and . ==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. 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. 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 (Awamoan to Lillburnian, 19–16 mya). Early European passerines '' fossil 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 • 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 ( 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. 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==

(Xenicus gilviventris), one of the two surviving species of suborder Acanthisitti 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 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. ::*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 ==