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Very small passerine bird in the kinglet family from Madeira

The Madeira firecrest, Madeira kinglet, or Madeiracrest (Regulus madeirensis) is a very small passerine bird endemic to the island of Madeira. It is a member of the kinglet family. Before it was recognised as a separate species in 2003, it was classified as a subspecies of the common firecrest. It differs in appearance and vocalisations from its relative, and genetic analysis has confirmed it as a different species. The Madeiran bird has green upperparts, whitish underparts and two white wingbars, and a distinctive head pattern with a black eye stripe, short white supercilium, and a crest that is mainly orange in the male and yellow in the female. The female Madeira firecrest builds a spherical nest from cobwebs, moss and small twigs, and she incubates the eggs and broods the chicks on her own. Both parents feed the young. This species forages for insects and other small invertebrates in tree heath, laurisilva and other woodland. It is common within its restricted range, and is not considered to be threatened.

The Madeira firecrest is a small plump bird, of length and weighing about It has bright olive green upperparts with a bronze coloured patch on each shoulder, and whitish underparts washed with brownish grey on the breast and flanks. It has two white wingbars, a tiny black bill and brownish black legs. The head pattern is striking, with a black eye stripe, white supercilium and a crest which is yellow in the female and mainly orange in the male. Juveniles have a grey tinge to the duller upperparts, and lack the crown and eye stripes and supercilium;

The vocalisations of Madeiran and common firecrests both consist of high pitched notes, but the Madeiran bird has its song divided into three distinct parts, whereas that of the more widespread species just accelerates gradually and covers a much smaller frequency range. The calls of both species include high pitched fine vocalisations , although the Madeiran firecrest also has a distinctive shrill and a whistled peep. especially as recent research showed that, despite superficial similarities, the crests are taxonomically remote from the warblers. The names of the family, Regulidae, and its only genus, Regulus, are derived from the Latin regulus, a diminutive of rex, "a king", and refer to the characteristic orange or yellow crests of adult kinglets. The species name madeirensis is derived from the island on which this bird is found. The Madeira firecrest was first described by English naturalist Edward Vernon Harcourt in 1851. Until recently, it was considered to be a subspecies, R. i. madeirensis, of the common firecrest R. ignicapillus. A phylogenetic analysis based on the cytochrome b gene showed that the Madeiran form is distinct at the species level from the firecrest nominate subspecies R. i. ignicapillus. Cytochrome b gene divergence between the Madeira firecrest and the European bird is 8.5%, comparable with the divergence level between other recognised Regulus species, such as the 9% between the goldcrest and the golden crowned kinglet. but some authorities, such as Clements, have not yet recognised the new species. The International Ornithological Congress' recommended English name for this species was "Madeiracrest", but this has been changed to "Madeira firecrest". The songs of the four subspecies of common firecrest (nominate R. i. ignicapillus, Mediterranean R. i. balearicus, southeastern R. i. caucasicus and North African R. i. laeneni) show a number of different song forms, but in general are very similar to each other, whereas the Madeiran firecrest has only one song type, which is divided into three phrases, two of them consisting of modified display and anger calls. Its display calls use a larger frequency range and more harmonics than the continental subspecies. Male common firecrests do not show a territorial response to recordings of the songs or calls of the Madeiran taxon, although Madeiran firecrests do react strongly to playback of the calls of the mainland birds. The island form was recognized as a separate species on the basis of differences from the mainland form in morphology, vocalisations, and genetics. The Atlantic archipelagos of the Canaries, Azores, and Madeira have a volcanic origin and they have never been part of a continent. The formation of Madeira started in the Miocene and the island was substantially complete 700,000 years ago. In the distant past the major islands of these archipelagos were all colonised by Regulus species, which evolved on their respective islands isolated from mainland populations. The firecrest descendant evolved in Madeira and goldcrest subspecies evolved on the other islands. Cytochrome b gene divergence between common firecrests from Europe and Madeira firecrests suggests an evolutionary separation roughly 4 million years ago, but with a preference for tree heaths. unlike the eggs of the common firecrest, which are pink with very indistinct reddish markings at the broad end. The clutch size is unknown, but believed to be smaller than the 7–12 of the nominate race of common firecrest. The female incubates the eggs for 14.5 to 16.5 days to hatching, and broods the chicks, which fledge 19 to 20 days after hatching. Both parents feed the chicks and fledged young. Other than bats, there are no native land mammals, although there are a number of introduced species, two of which will take birds or chicks. These are brown rats and feral domestic cats. Even the high mountain nest sites of the endangered Zino's petrel are at risk from these predators. Data on specific parasites of the Madeira firecrest is lacking, but the widespread flea Dasypsyllus gallinulae has been recorded in a related Regulus species, and significant infection by non native pathogens such as avian pox and avian malaria has been detected in another Macaronesian bird, the Berthelot's pipit.