Eastern Spot-billed Duck

Identification

The Eastern Spot-billed Duck is a medium-sized dabbling duck, approximately the same size as a mallard, measuring 55–63 cm in length with a wingspan of 83–95 cm. Both males and females are predominantly grey with a distinctive paler head and neck, contrasting with a black bill tipped bright yellow—the namesake feature that identifies this species. The wings display a striking white-bordered green speculum when in flight, with whitish wing coverts and black flight feathers visible from below. The legs and feet are bright orange, providing another helpful field mark. Juveniles are considerably browner and duller than adults, while the body plumage features an overall scaly pattern. Unlike some duck species, males lack an eclipse plumage, maintaining consistent coloration year-round.

This species is darker and browner than its close relative, the Indian Spot-billed Duck, and notably lacks the red bill spot characteristic of that species. Both males and females produce calls similar to mallards, with females delivering a loud quack and males a deeper, quieter vocalization. Both sexes undergo a complete postnuptial moult, simultaneously dropping all wing feathers during this vulnerable period.

Range & Habitat

The Eastern Spot-billed Duck is a migratory species that breeds in East and Southeast Asia, wintering in southern China and possibly Southeast Asia. Notably, populations in Japan and the Russian Far East have expanded their range northwards by more than 500 km since the early 20th century, a shift possibly driven by global warming. The species is occasionally recorded as a rare vagrant to the Aleutian Islands of Alaska.

This duck favours freshwater lakes and marshes in fairly open country. It is quite gregarious outside the breeding season, forming small flocks with other individuals and species. The breeding season varies depending on local rainfall and water conditions but typically occurs between April and July, with birds nesting on the ground in vegetation near water.

Behaviour & Diet

The Eastern Spot-billed Duck is a dabbling duck that feeds primarily on plant material, foraging mainly in the evening or at night when it is less conspicuous. Its feeding behaviour involves the typical dabbling technique of tipping forward in shallow water to access submerged vegetation.

During breeding season, pairs establish territories and construct ground nests in waterside vegetation. Clutches typically contain 7–9 eggs, and incubation begins only after the last egg is laid, ensuring that chicks hatch simultaneously after approximately 24 days. The chicks are black with a yellow back and resemble mallard ducklings closely, though they possess a wider eyestripe. Young birds fledge and become independent as they grow through summer and autumn.

Best Time & Places to See It

The best opportunities to observe Eastern Spot-billed Ducks occur during the winter months in southern China, where this migratory species congregates in significant numbers. Freshwater lakes and marshes in open landscapes are the prime habitats to search, particularly where shallow water and aquatic vegetation provide ideal feeding grounds. Winter visits to wetland reserves and protected areas in China offer the most reliable sightings, especially where birds gather in small flocks.

During breeding season, observers in Japan and the Russian Far East may encounter this species in suitable breeding habitat from April through July. However, winter populations in China provide the most accessible and productive viewing opportunities for most travellers.

Photography Tips

Photograph this species in early morning or late afternoon light to best capture the subtle grey plumage and vibrant yellow bill tip. The bright orange legs and feet are distinctive features worth highlighting in your images. When birds are in flight, aim to capture the striking white-bordered green speculum and the contrast between white wing coverts and black flight feathers, which are particularly striking from below.

Since these ducks feed primarily in evening and night hours, schedule photography sessions accordingly for natural feeding behaviour. In winter, when birds gather in flocks, focus on capturing both individual portraits showing the pale head and black bill, and wider habitat shots that convey their gregarious nature and wetland environment.