How to Identify Green-tailed Sunbird Feathers

What Green-tailed Sunbird's Feathers Look Like

True to its name, the male Green-tailed Sunbird's most diagnostic feature is its tail: the central tail feathers are elongated, narrow, and pointed, with an iridescent metallic green sheen that catches the light - a shape and color combination shared by only a handful of related sunbirds. The crown and shoulders show a matching iridescent metallic green-gold, while the throat and upper breast are a vivid scarlet to crimson, with small, densely packed, slightly iridescent-tipped feathers typical of nectar-feeding sunbirds. The back is a duller olive-green, and the rump shows a patch of yellow. Females are far plainer: olive-green above and yellowish below, with a normal-length tail and no elongated streamers at all.

Step-by-Step: Is This Feather From a Green-tailed Sunbird?

• Check for an elongated, narrow, pointed tail feather. If it's iridescent metallic green and clearly longer/narrower than a typical contour feather, that's the best single diagnostic for a male of this species.
• Look at throat/breast feathers for scarlet color. Small, vividly red feathers with a slight sheen suggest the throat/breast region.
• Check crown feathers for metallic green-gold. Iridescent feathers from the head support the ID.
• Look for yellow on the rump. A small yellow feather from the lower back is consistent with this species.
• Consider that a plain olive-green/yellow feather may be a female - harder to pin to species without the male's diagnostic tail streamer.

Similar Species & How to Tell Them Apart

• Fire-tailed Sunbird: Has an elongated tail as well, but it's red/maroon rather than green - if the elongated tail feather is warm-red rather than metallic green, Fire-tailed Sunbird is the better match.
• Green-backed and Black-throated Sunbirds: Share overall body tones but differ in throat color and the presence/length of tail streamers - check specifically whether the throat is scarlet (this species) versus other colors, and whether the tail streamer is green.
• Other Aethopyga sunbirds generally: The genus is diverse across Asia; the elongated metallic GREEN tail streamer combined with a scarlet throat is the most reliable combination pointing specifically to this species.
• Non-elongated-tail sunbirds: Many lowland sunbird species never grow tail streamers at all, so any elongated central tail feather - regardless of exact color - already narrows things down to this small group of montane specialists.

Where & When You'll Find Them

Green-tailed Sunbirds live in montane forest edges and rhododendron scrub across the Himalayas and into parts of Southeast Asia, generally at moderate to high elevations. Many populations are altitudinal migrants, moving to lower elevations in winter rather than staying put year-round - so at higher sites, feathers are more likely found during the breeding season (local spring/summer), while at lower wintering elevations, feathers may turn up mainly outside the breeding months.