Eastern Spot-billed Duck illustration
Birdsong field guide

Eastern Spot-billed Duck

Anas zonorhyncha

The Eastern Spot-billed Duck is a large, non-migratory dabbling duck of East Asia, distinguished by its dark, scaly plumage and a prominent yellow tip on its black bill.

What it sounds like

A series of loud, harsh quacks similar to a Mallard, though typically deeper and more raspy in tone.

Reference call, compare with what you heard
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Rec. 小菜鸟 · ChinaCC BY-NC-SAXeno-canto

Field notes

  • It was formerly considered a subspecies of the Indian Spot-billed Duck but is now recognized as a distinct species based on genetic and morphological differences.
  • Unlike many other dabbling ducks, this species exhibits minimal sexual dimorphism, with males and females appearing nearly identical.
  • The species possesses a vibrant blue speculum on the wing, which is bordered by a distinct white band visible in flight.
  • It frequently hybridizes with Mallards in areas where their ranges overlap, leading to offspring with varied bill colorations.
  • It is one of the few duck species that thrives in human-modified landscapes, often nesting in high densities within rice paddies.
Habitat
Freshwater wetlands, lakes, marshes, and flooded agricultural fields, particularly rice paddies.
Range
East Asia, including eastern Russia, Mongolia, China, Japan, and the Korean Peninsula.

Similar & commonly confused birds

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