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Genus Regulus
Ruby-crowned Kinglet - The Ruby-crowned Kinglet was described in 1766 by Linnaeus; its generic name is Latin for 'little king'. The Kinglets are a group which appear to be only distantly related to all other passerines. The Ruby-crowned Kinglet differs sufficiently in its voice and plumage from other kinglets that it is occasionally placed in its own genus, Corthylio.
Taiwan Firecrest - The Taiwan Firecrest is a small-bodied perching bird, resembling a warbler. Its total length is only 9 cm. It is the smallest of all the endemic bird species in Taiwan, and the most colorful member of its family, Regulidae, in the world.
Regulus ignicapilla - This is the second smallest European bird at 9 to 10 cm. The Firecrest is greenish above and has whitish underparts. It has two white wingbars, a black eye stripe and a white supercilium. It has a crest, orange in the male and yellow in the female, which is displayed during breeding, and gives rise to the English name for the species. This is a restless species, constantly on the move as it searches for insects, and frequently hovering. It resembles the Goldcrest, but its bronze shoulders and strong face pattern are distinctive.
Regulus madeirensis - The Madeira Firecrest is a member of the kinglet family and is very closely allied to the Firecrest, which it was considered a subspecies of until recently. It differs in having a shorter supercilium, duller orange crest and a longer bill, as well as a different song and call notes.
Goldcrest - The Goldcrest is the smallest European bird, measuring from 8.5 to 9.5 cm and weighing as little as 5 g. It is dull greenish above, with buff/white underparts, two white wingbars, and a plain face with a conspicuous black eye. The crown has black sides and a narrow black front, and a bright central crest, orange in the male and yellow in the female, which is displayed during breeding. It is a restless species, constantly on the move as it searches for insects.
Golden-crowned Goldcrest - Adults are olive-gray on the upperparts with white underparts, with thin bills and short tails. They have white wing bars, a black stripe through the eyes and a yellow crown surrounded by black. The adult male has an orange patch in the middle of the yellow crown.