Andean Duck

Identification

The Andean duck is a small, compact waterfowl belonging to the stiff-tailed duck group. One of its most distinctive features is its long, stiff tail, which the bird often holds cocked upward. Look for a slightly peaked head, a fairly short thick neck, and a characteristic scoop-shaped bill. Breeding plumage is particularly striking: males display rich chestnut bodies paired with bright blue bills during summer months. In winter, they transition to duller plumage, becoming gray-brown above with paler underparts and dull gray bills. Females and first-year males are brownish overall, similar to winter males but distinguished by a blurry stripe running across their pale cheek patch. The Andean duck can be distinguished from the closely related ruddy duck by its all-black face and noticeably larger size.

Range & Habitat

Native to the Andean Mountains of South America, the Andean duck inhabits high-altitude wetland environments. These birds are most commonly found in marshy lakes and ponds throughout the Andean region. They prefer dense marsh vegetation near water, where they can nest and forage safely. The species has historically been considered a subspecies of the ruddy duck, and some taxonomic authorities maintain this classification, though it is now generally recognized as a distinct species.

Behaviour & Diet

The Andean duck is an accomplished aquatic forager, spending much of its time diving and swimming underwater in search of food. Their diet is primarily vegetarian, consisting mainly of seeds and roots from aquatic plants, though they supplement this with aquatic insects and crustaceans. During breeding season, females construct nests from grass in tall vegetation near water, positioning them carefully to conceal them from predators. A typical brood consists of 5 to 15 ducklings, representing a substantial breeding investment for this small species.

Best Time & Places to See It

Observers seeking the Andean duck should focus on marshy lakes and ponds within the Andean Mountains. Breeding season is the optimal time to locate these birds, as they concentrate in their preferred marsh habitats for nesting and raising young. The striking summer plumage of males, with their brilliant blue bills and rich chestnut bodies, makes them particularly conspicuous during this period and offers the best viewing opportunities for travellers visiting high-altitude Andean wetlands.

Photography Tips

Photographing the Andean duck requires patience and positioning near marshy lakes and ponds where they congregate. During breeding season, males in their vibrant summer plumage offer the most photogenic opportunities, particularly the contrast between their chestnut bodies and bright blue bills. Since these birds are diving ducks that spend considerable time underwater, prepare for frequent submersions by using fast shutter speeds and burst mode. Early morning light at high altitude can be particularly effective for capturing the rich colours of breeding males and their distinctive cocked-tail posture.