Olive-backed Sunbird

Overview

The Olive-backed Sunbird is one of the most widely distributed sunbirds, ranging from the Indian subcontinent through Southeast Asia to New Guinea and northern Australia. It readily adapts to human-modified landscapes, including gardens and parks.

Breeding males show an iridescent blue-black throat patch bordered by yellow underparts, while females and non-breeding males lack this glossy throat, appearing more uniformly olive and yellow.

Feather Identification

• Body feathers: Olive-green above, bright yellow below, generally unstreaked
• Throat feathers: Breeding males show small, scale-like, iridescent blue-black feathers forming a dark throat patch, often bordered with maroon
• Tail feathers: Dark, slightly notched, without strong iridescence
• Shaft color: Pale on yellow underparts, dark on the throat patch
• Size: Small and slender, with a fine, slightly decurved bill typical of sunbirds
• Similar species: Females and non-breeding males resemble other yellow-bellied sunbirds in the region and are best told by range and subtle upperpart tone; breeding males are distinctive with their dark throat

Plumage Details

Breeding males show a glossy blue-black throat patch, sometimes bordered by a maroon band, over otherwise olive-green upperparts and yellow underparts. Non-breeding males often lose some throat gloss, appearing more like females, which are olive above and yellow below without the dark throat. Juveniles resemble females. Some populations show partial seasonal variation in male throat brightness tied to breeding condition.

Habitat & Range

This species occupies an extensive range from India and Sri Lanka through Southeast Asia, the Philippines, Indonesia, New Guinea, and into coastal northern Australia. It favors gardens, parks, mangroves, forest edges, and coastal scrub, and is largely non-migratory, being a common resident bird across much of its range.

Behavior & Field Notes

Olive-backed Sunbirds feed primarily on nectar from flowering plants, supplementing their diet with small insects and spiders, often gleaned while hovering briefly at flowers. They build distinctive hanging, pouch-shaped nests suspended from branches or eaves, often in close proximity to human dwellings. Calls include high-pitched, wiry chips and a rapid, chattering song delivered from open perches. This adaptable species is a common sight in urban and suburban gardens across its range.