Indian Spot-billed Duck

Fascinating facts about the Indian Spot-billed Duck

• At just over half a meter long, the Indian spot-billed duck rivals a mallard in size yet packs a surprising heft. It measures 55-63 cm (22-25 in) in length and spans 83-95 cm (33-37 in) across the wings, while its body mass ranges from 790 to 1,500 g (1.74-3.31 lb). Its solid build also supports the energetic dabbling for plant foods at dusk and night. Understanding its size helps birdwatchers distinguish it from similar ducks on the water.
• Since the early 1900s the duck's northern frontier has leapt more than 500 km farther north, a shift scientists link to a warming climate. The species, once confined to the Indian subcontinent's low-lying wetlands, now breeds in areas previously too cold for its survival.
• When the Indian spot-billed duck nests, it can lay a clutch of 8-14 eggs, then waits until the last egg is laid before starting incubation. This strategy ensures all chicks hatch together about 24 days later. The ground nest, hidden in vegetation near water, sometimes even clings to low branches draped in creepers. July-September window in northern India.
• In Bangladesh's Tanguar Haor, a Ramsar-designated wetland covering 9,500 ha (23,500 ac), Indian spot-billed ducks are among the resident waterfowl facing mounting threats. The area receives about 5,000 mm (nearly 16.5 ft) of rain each year, swelling water levels to 6-10 m (20-33 ft) in the monsoon, then dropping to 2-6 m (6-20 ft) in the dry season and exposing nutrient-rich beels. Over the past three decades, two-fifths of the original basin has been converted to farmland, while increased duck rearing, grazing, boats, and fuel-wood collection further disturb habitats. These changes jeopardise not only the ducks but also local fisheries that rely on the same shallow waters. Protecting the beels and curbing land conversion are essential to keep the duck's populations stable.
• The duck's diet of snails doubles as a parasite highway: when it eats Lymnaea luteola, it picks up the trematode Echinoparyphium bagulai, which matures inside the bird and emerges after roughly 21 days. These adult trematodes then exit the duck.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia
• Mongabay

At a glance

About the Indian Spot-billed Duck

The Indian Spot-billed Duck (Anas poecilorhyncha) is a captivating waterfowl, distinguished by its striking plumage and unique markings. Males exhibit a rich chestnut breast, complemented by a mottled gray body and a distinctive spot of yellow on their bill, while females possess a more subdued coloration, cloaked in browns and blacks that provide excellent camouflage. These ducks are primarily found in freshwater habitats such as marshes, lakes, and rivers across the Indian subcontinent, where they can often be seen dabbling in shallow waters, foraging for aquatic plants, insects, and small crustaceans. Their social nature is evident as they form small flocks, engaging in playful displays that include head-bobbing and synchronized swimming, which not only serve as a means of communication but also as a bonding ritual among mates. What truly sets the Indian Spot-billed Duck apart is its fascinating adaptation to urban environments. While many species shy away from human presence, these ducks have shown remarkable resilience, often frequenting parks, gardens, and even rice paddies in populated areas. This adaptability speaks to their intelligence and resourcefulness, as they navigate the complexities of urban life while still fulfilling their ecological roles. As they glide gracefully across the surface of the water, their vibrant colors reflecting in the sunlight, one cannot help but marvel at the beauty and complexity of this species, a reminder of nature's resilience in an ever-changing world.

More birds to discover

Browse Feravox