Common Firecrest
Regulus ignicapilla
The common firecrest is a small plump bird, 9 cm (3.5 in) in length with a wingspan of 13–16 cm (5.1–6.3 in), and weighs 4–7 grams (0.14–0.25 oz). 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 pointed bill, and brownish-black legs. The head pattern is striking, with a black eye stripe, long white supercilium, and a crest which is bright yellow in the female and mainly orange in the male. Voice: The contact call is three or four thin high notes, similar to that of goldcrest, but slightly lower in pitch, zit-zit-zit rather than see-see-see. The song is a succession of call notes in a longer and slightly more varied sequence.
ID text from Wikipedia, CC BY-SA 4.0
Flamecrest
Regulus goodfellowi
The flamecrest is a small perching bird, resembling a warbler. Its length is only 9 cm (3.5 in) and weight about 7 g, making it the smallest of all Taiwan's endemic bird species, and the smallest and most colourful member of its family in the world. The top of its head is yellow and orange, with black crown stripes. White feathers encircling the black eye-patches give it the appearance of having two black eyes. The most distinguishing characteristic is the orange-yellow crest on top of the head, for which it is named. Voice: Flamecrests have fine, shrill and high-pitched calls, zi zi yi. Although noisy at close range, the voice is soft and does not carry far.
ID text from Wikipedia, CC BY-SA 4.0
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