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The Gould's jewelfront (''Heliodoxa aurescens'') is a medium-sized hummingbird in the Trochilidae family. It is found in tropical and equatorial South America. This is an uncommon species with an unusually large range compared to the other members of ''Heliodoxa''. The common name commemorates the English ornithologist and bird artist John Gould (1804–1881). ==Description== ''H.aurescens'' ranges in size from 11 to 12 cm, with an average weight of about 6.2g.〔 This is a sexually dimorphic species with minor differences in plumage and bill lengths between sexes. Both sexes have a narrow frontlet of glittering purplish-blue which is underdeveloped in immature individuals. The bill, black to dark coloured〔 is “unspecialised” being relatively short and straight; while the irises are brown and tarsus black. The tail is forked with the central pair of feathers bronze-green while the other tail feathers have chestnut edges and bronze-green tips. Undertail coverts are a deep fawn colour and wings are purplish-brown.〔 It is noted that there is some variation in plumage for this species, but these differences do not relate to location and is minimal when considering the wide range.〔 Specimens examined by Peter Cotton had an average wing length of 60.5mm and exposed culmen length of 18.5mm. Gould's original specimen had a bill of 2.5 cm and tail length of 31.75mm.〔 The average c-value of the genome is 1.1135pg based on four specimens ranging from 1.045-1.162pg. Males have shining grass green upperparts with the sides of the neck and lower throat glittering golden green bordered by a distinctive orange/rufous breast band. The chin, lores and upper throat are velvety black while the rest of the underparts are shining green.〔 Females appear generally similar to the male but are somewhat duller coloured and have a green crown. They have a slightly larger bill than the male (with a Lovich-Gibbons ratio of 0.030). The chin feathers have buff tips and the throat is greyish with green discs. Females also feature a malar stripe (from the base of the bill towards the neck) which is buff to chestnut coloured.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gould's jewelfront」の詳細全文を読む スポンサード リンク
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