Crimson Sunbird

Overview

The Crimson Sunbird is a brightly colored species found across the Indian subcontinent and much of Southeast Asia, favoring forest edges, gardens, and scrubby habitats. It is the national bird of Singapore and one of the more visually striking sunbirds in its range.

Adult males show brilliant crimson upperparts and throat, a metallic green crown, and elongated central tail feathers, while females are much plainer, with olive-yellow tones and no elongated tail.

Feather Identification

• Body feathers: Males bright crimson-red across the throat, breast, and back, with olive-yellow underparts toward the belly
• Crown feathers: Small, iridescent, metallic green in males
• Tail feathers: Central pair elongated into a narrow streamer in males, lacking in females
• Shaft color: Dark in the crimson body feathers, pale on the olive underparts
• Size: Small-bodied, with the male's tail streamer adding notably to overall length
• Similar species: The combination of crimson body, green crown, and elongated tail is distinctive among sunbirds in its range; females resemble other olive sunbirds and are best told by range and association with males

Plumage Details

Adult males show brilliant crimson plumage across the head, throat, and back, a small iridescent green crown patch, olive-yellow underparts, and an elongated central tail streamer. Females are olive-green above and yellowish below, lacking both the crimson coloring and tail streamer. Juveniles resemble females. Some populations show males with grayish rather than olive lower underparts, but no pronounced seasonal plumage shift occurs.

Habitat & Range

Crimson Sunbirds range widely across the Indian subcontinent, Southeast Asia, and the Sunda region, inhabiting forest edges, gardens, mangroves, and scrub. The species is largely resident and non-migratory, occurring across a broad range of lowland and hill habitats.

Behavior & Field Notes

This sunbird feeds primarily on nectar from a wide variety of flowering plants, while also taking small insects and spiders, especially when feeding young. It constructs a hanging, pouch-shaped nest suspended from branches or vegetation. Calls include high-pitched, wiry notes and rapid twittering songs given from exposed perches. Males are often more conspicuous than females due to their bright coloring and active territorial displays around flowering plants.