Question: What is the wingspan of the red-eared firetail?

Estrildidae


Estrildidae, or estrildid finch, is a family of small passerine birds of the Old World tropics and Australasia. They can be classified as the family Estrildidae, comprising species commonly known as munias, mannakins, firefinches, parrotfinches and waxbills,[1] or as a subfamily within the family Passeridae, which strictly defined comprises the Old World sparrows.[2]  Despite the word "finch" being included in the common names of many of the species, they are not closely related to birds with this name in other families, such as the Fringillidae, Emberizidae or Passerellidae.
They are gregarious and often colonial seed eaters with short, thick, but pointed bills. They are all similar in structure and habits, but vary widely in plumage colours and patterns.
All the estrildids build large, domed nests and lay five to tenwhite eggs. Many species build roost nests. Some of the fire-finches and pytilias are hosts to the brood-parasitic indigobirds and whydahs, respectively.
Most are sensitive to cold and require warm, usually tropical, habitats, although a few, such as the eastern alpine mannikin, mountain firetail and red-browed finch, and the genus Stagonopleura, have adapted to the cooler climates of southern Australia and the highlands of New Guinea.
The smallest species of the family is the Shelley's oliveback (Nesocharis shelleyi) at a mere 8.3 centimetres (3.3in), although the lightest species is the black-rumped waxbill (Estrilda troglodytes) at 6g (0.21oz). The largest species is the Java sparrow (Padda oryzivora), at 17cm (6.7in) and 25g (0.88oz).[3]
Species list
Antpeckers, genus Parmoptila
Red-fronted antpecker, Parmoptila rubrifrons
Jameson's antpecker, Parmoptila jamesoni– often included in P. rubrifrons
Woodhouse's antpecker, Parmoptila woodhousei
Nigritas, genus Nigrita
White-breasted nigrita, Nigrita fusconota
Chestnut-breasted nigrita, Nigrita bicolor
Pale-fronted nigrita, Nigrita luteifrons
Grey-headed nigrita, Nigrita canicapilla
Olivebacks, genus Nesocharis
White-collared oliveback, Nesocharis ansorgei
Shelley's oliveback, Nesocharis shelleyi
Grey-headed oliveback, Nesocharis capistrata
Pytilias, genus Pytilia
Orange-winged pytilia, Pytilia afra
Red-winged pytilia, Pytilia phoenicoptera
Red-billed pytilia, Pytilia lineata
Green-winged pytilia, Pytilia melba
Yellow-winged pytilia, Pytilia hypogrammica
Crimsonwings, genus Cryptospiza
Red-faced crimsonwing, Cryptospiza reichenovii
Abyssinian crimsonwing, Cryptospiza salvadorii
Dusky crimsonwing, Cryptospiza jacksoni
Shelley's crimsonwing, Cryptospiza shelleyi
Seedcrackers, genus Pyrenestes
Crimson seedcracker, Pyrenestes sanguineus
Black-bellied seedcracker, Pyrenestes ostrinus
Lesser seedcracker, Pyrenestes minor
Bluebills, genus Spermophaga
Grant's bluebill, Spermophaga poliogenys
Western bluebill, Spermophaga haematina
Red-headed bluebill, Spermophaga ruficapilla
Genus Mandingoa
Green-backed twinspot, Mandingoa nitidula
Genus Clytospiza
Brown twinspot, Clytospiza monteiri
Genus Hypargos
Red-throated twinspot, Hypargos niveoguttatus
Pink-throated twinspot, Hypargos margaritatus
Genus Euschistospiza
Dybowski's twinspot, Euschistospiza dybowskii
Dusky twinspot, Euschistospiza cinereovinacea
Genus Lagonosticta, firefinches 
Bar-breasted firefinch, Lagonosticta rufopicta
Brown firefinch, Lagonosticta nitidula
Red-billed firefinch, Lagonosticta senegala
Black-bellied firefinch, Lagonosticta rara
African firefinch, Lagonosticta rubricata
Landana firefinch, Lagonosticta landanae
Jameson's firefinch, Lagonosticta rhodopareia
Mali firefinch, Lagonosticta virata
Rock firefinch, Lagonosticta sanguinodorsalis
Black-faced firefinch, Lagonosticta larvata
Chad firefinch, Lagonosticta umbrinodorsalis
Genus Uraeginthus cordon-bleus,
Blue waxbill, Uraeginthus angolensis
Red-cheeked cordon-bleu, Uraeginthus bengalus
Blue-capped cordon-bleu, Uraeginthus cyanocephalus
Purple grenadier, Uraeginthus ianthinogaster
Violet-eared waxbill, Uraeginthus granatinus
Genus Coccopygia
Yellow-bellied waxbill, Coccopygia quartinia
Swee waxbill, Coccopygia melanotis
Genus Estrilda, waxbills
Lavender waxbill, Estrilda caerulescens
Grey waxbill, Estrilda perreini
Cinderella waxbill, Estrilda thomensis
Fawn-breasted waxbill, Estrilda paludicola
Anambra waxbill, Estrilda poliopareia
Orange-cheeked waxbill, Estrilda melpoda
Arabian waxbill, Estrilda rufibarba
Crimson-rumped waxbill, Estrilda rhodopyga
Black-rumped waxbill, Estrilda troglodytes
Common waxbill, Estrilda astrild
Black-lored waxbill, Estrilda nigriloris
Black-crowned waxbill, Estrilda nonnula
Black-headed waxbill, Estrilda atricapilla
Kandt's waxbill, Estrilda kandti
Black-faced waxbill, Estrilda erythronotos
Black-cheeked waxbill, Estrilda charmosyna
Genus Amandava avadavats
Red avadavat, Amandava amandava also known as red munia
Green avadavat, Amandava formosa
Orange-breasted waxbill, Amandava subflava
Quailfinches, genus Ortygospiza
Black-chinned quailfinch, Ortygospiza gabonensis
Black-faced quailfinch, Ortygospiza atricollis
African quailfinch, Ortygospiza fuscocrissa
Genus Paludipasser
Locust finch, Paludipasser locustella
Genus Emblema
Painted finch, Emblema pictum
Genus Stagonopleura
Beautiful firetail, Stagonopleura bella
Red-eared firetail, Stagonopleura oculata
Diamond firetail, Stagonopleura guttata
Genus Oreostruthus
Mountain firetail, Oreostruthus fuliginosus
Genus Neochmia
Red-browed finch, Neochmia temporalis
Crimson finch, Neochmia phaeton
Star finch, Neochmia ruficauda
Plum-headed finch, Neochmia modesta
Genus Taeniopygia
Zebra finch, Taeniopygia guttata
Double-barred finch, Taeniopygia bichenovii
Genus Poephila
Masked finch, Poephila personata
Long-tailed finch, Poephila acuticauda
Black-throated finch, Poephila cincta
Parrotfinches, genus Erythrura
Tawny-breasted parrotfinch, Erythrura hyperythra
Pin-tailed parrotfinch, Erythrura prasina
Green-faced parrotfinch, Erythrura viridifacies
Tricolored parrotfinch, Erythrura tricolor
Blue-faced parrotfinch, Erythrura trichroa
Red-eared parrotfinch, Erythrura coloria
Papuan parrotfinch, Erythrura papuana
Red-throated parrotfinch, Erythrura psittacea
Fiji parrotfinch, Erythrura pealii
Red-headed parrotfinch, Erythrura cyaneovirens
Royal parrotfinch, Erythrura regia
Pink-billed parrotfinch, Erythrura kleinschmidti
Gouldian finch, Erythrura gouldiae
Genus Euodice
African silverbill, Euodice cantans
Indian silverbill, Euodice malabarica also known as white-throated munia
Genus Odontospiza
Grey-headed silverbill, Odontospiza caniceps
Genus Lonchura, Munias, mannikins and silverbills
Madagascar mannikin, Lonchura nana
Bronze mannikin, Lonchura cucullata also known as bronze munia
Black-and-white mannikin, Lonchura bicolor also known as black-and-white munia
Red-backed mannikin, Lonchura nigriceps also known as brown-backed munia
Magpie mannikin, Lonchura fringilloides also known as magpie munia
White-rumped munia, Lonchura striata
Javan munia, Lonchura leucogastroides
Dusky munia, Lonchura fuscans
Black-faced munia, Lonchura molucca
Black-throated munia, Lonchura kelaarti also known as Jerdon's mannikin
Scaly-breasted munia, Lonchura punctulata also known as nutmeg mannikin or spice finch
White-bellied munia, Lonchura leucogastra
Streak-headed munia, Lonchura tristissima
Chestnut munia, Lonchura atricapilla
Tricolored munia, Lonchura malacca
White-capped munia, Lonchura ferruginosa
Cream-bellied munia, Lonchura pallidiventer 
Five-colored munia, Lonchura quinticolor
White-headed munia, Lonchura maja
Pale-headed munia, Lonchura pallida
Great-billed mannikin, Lonchura grandis
Grey-banded mannikin, Lonchura vana
Grey-crowned mannikin, Lonchura nevermanni
Hooded mannikin, Lonchura spectabilis
Hunstein's mannikin, Lonchura hunsteini
Forbes's mannikin, Lonchura forbesi
New Hanover mannikin, Lonchura nigerrima
Yellow-rumped mannikin, Lonchura flaviprymna
Chestnut-breasted mannikin, Lonchura castaneothorax
Black mannikin, Lonchura stygia
Black-breasted mannikin, Lonchura teerinki
Western alpine mannikin, Lonchura montana
Eastern alpine mannikin, Lonchura monticola
Buff-bellied mannikin, Lonchura melaena
Java sparrow, Lonchura oryzivora
Timor sparrow, Lonchura fuscata
Genus Heteromunia
Pictorella mannikin, Heteromunia pectoralis
Cut-throats, genus Amadina
Cut-throat finch, Amadina fasciata
Red-headed finch, Amadina erythrocephala
Evolution

The phylogeography and possible origin of estrildid species have been studied. The following scheme may be useful to represent a hypothetical origin in India in the last and stronger Himalayas uplift (16.5 million years ago), when the monsoon rains regime was established in India (see figure). The conclusions from this study[4][5] are:
Estrildids are a monophyletic group with polytomies that may have started evolving by Middle Miocene Epoch (about 16.5 million years ago)
This proposed timing is coincidental with the Fringillinae radiation starting time and also with the biggest Himalayan and Tibetan Plateau uplift, triggered by the Indian tectonic plate strongest collision; this established present day southern Asia monsoon regime and other drastic climatic changes, like drier weather in the Tibetan Plateau and Chinese deserts.
The estrildids form a monophyletic group which includes several polytomies and comprises African, Asian and Australian birds.
The most ancient evolutive group comprises African (African silverbill), Asian (Indian silverbill) and Australian (diamond firetail); this suggests that the whole Estrildids radiation might have originated around India.[4][6][7]

The African group Nesocharis is grouped with the African gender Estrilda.
The Gouldian finch (Erythrura or Chloebia gouldiae) is definitely included within genus Erythrura with the other species.
The Java sparrow (Padda or Lonchura oryzivora) is a very modified species from genus Lonchura: bigger than the rest of Lonchura species, and a noticeable and quite different head pattern. It is endemic to Java, Bali, and the Bawean Islands, although escapes from captivity can be seen today in other neighboring islands.
African munias (Spermestes) belong to a genus totally different from Australian and Asian munias.
The Australian red-browed firetail (Neochmia temporalis), very similar to African common waxbill (Estrilda astrild), is unrelated to it. Their similarities (bill, red brow, etc.) are due to convergent evolution, since their environmental pressures (weather, habitat, feeding) are similar.[4][7]





 — specialist waxbill bird society based in the UK.