Crimson Sunbird

Fascinating facts about the Crimson Sunbird

• At just 11 cm long, the crimson sunbird has short, powerful wings that allow it to dart through the forest.
• Their down-curved bill and brush-tipped tubular tongue act like a built-in straw, allowing the bird to sip nectar while hovering like a hummingbird or simply perching on a flower. This dual feeding style lets them harvest energy quickly and still grab insects for their chicks, illustrating a clever dietary balance.
• In the wild, a pair lays only two or three eggs in a suspended nest dangling from a tree branch.
• While most male crimson sunbirds flaunt a long green-blue tail, the Nicobar Island subspecies (A. s. nicobarica) and the former Western Ghats form (A. vigorsii) completely lack those central tail feathers. This geographic tail variation reveals how isolated populations can diverge in appearance without becoming separate species.
• Declared the unofficial national bird of Singapore by the Nature Society Singapore, the crimson sunbird occurs in both forest and cultivated areas.

At a glance

About the Crimson Sunbird

The crimson sunbird (Aethopyga siparaja) is a diminutive avian jewel, measuring just 11 cm, its sleek form built for a life of nectar hunting. Its medium-length, down-curved bill and brush-tipped tubular tongue are perfect tools for extracting sweet fluids from flowers, while its short, rapid wings enable a fast, direct flight that can hover like a hummingbird when needed, though it usually perches to sip. The adult male dazzles with a crimson breast, maroon back, black malar stripes, a yellow rump, and an olive belly, capped by a long green-blue tail in most of its range; the female, in contrast, sports an olive-green back, yellowish breast and white-tipped outer tail feathers. A surprising twist appears in the Nicobar Islands, where the subspecies A.s. nicobarica and the former A. vigorsii of India lack the long central tail feathers, hinting at localized adaptation. Their simple chee-cheewee call punctuates the forest canopy where they nest in suspended tree structures, laying two or three eggs. Across tropical southern Asia, from India and Nepal through Pakistan, Bangladesh, Myanmar, Indonesia to Brunei, this resident breeder thrives in both forested and cultivated landscapes, its presence so beloved that the Nature Society Singapore has declared it the unofficial national bird of Singapore, a testament to its vibrant role in the region’s avifauna.

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