Horned sungem: Difference between revisions

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==Description==
[[File:Heliactin bilophus 348331475.jpg|thumb|left|Male near [[Serra do Cipó National Park]]|alt=Male perching on a twig in front-side view]]
The horned sungem is a small hummingbird with a long tail, measuring {{convertcvt|9.5|to|11|cm|in|abbr=on}} in length and weighing {{convertcvt|1.8|to|2.8|g|oz|2|abbr=on}}. Both the male and female are light-colored with a metallic yellow-green upperside and a white underside. The sides of the neck are also white, giving the impression of a half-collar. The flight feathers are black-brown, and the bill and feet are black. The bill is slender, straight, and comparatively short, measuring {{convertcvt|1.6|cm|abbr=on}} in length. The tail feathers are pointed, and the middle four tail feathers are much longer than the outer ones. The middle two tail feathers are [[Buff (colour)|buff]] in the male and green in the female, and the remaining tail feathers are mostly white. The upper part of the tail, when viewed from below, shows a black band that forms a V-shape.<ref name=HOSU-BOW/><ref name="Fogden">{{cite book |title=Hummingbirds – a Guide to Every Species |last1=Fogden |first1=M. |last2=Taylor |first2=M. |last3=Williamson |first3=S.L. |date=2014 |publisher=Ivy Press |location=Lewes |isbn=978-1-78240-089-9 |page=70}}</ref><ref name="suriname"/><ref name="birdsofbrazil" /><ref name="Restall2006"/>
 
The species shows pronounced [[sexual dimorphism|differences between male and female]]. The male is recognized as particularly beautiful and spectacular, with [[Iridescence|iridescent]] feather tufts ("horns") above the eyes.<ref name=HOSU-BOW/> Each of these tufts consists of a row of six feathers that are inclined backwards and are fiery red at their base, golden in the middle, and golden-green at their tips. The other feathers of the upper surface of the head are shiny dark blue to blue green and form a low crest at the back. The throat and side of the head up to the ear region are covered with non-iridescent black feathers; those of the middle of the throat are very long, forming a pointed "beard" that extends above the white feathers of the breast.<ref name="wiedneuwied"/><ref name=HOSU-BOW/><ref name="Restall2006"/> The female is plainer, without the "horns", the black feathers, and the iridescent head feathers.<ref name=HOSU-BOW/> Its chin and throat are brown or yellow-buff, with darker tones on the sides of the head. Its tail is shorter than that of the male.<ref name="robber"/><ref name="Restall2006"/> Juveniles resemble females.<ref name=HOSU-BOW/>