Laysan Duck vs Black Swan
Anas laysanensis so với Cygnus atratus
Side-by-Side Comparison
| Thuộc Tính | Laysan Duck | Black Swan |
|---|---|---|
| Tên Khoa Học | Anas laysanensis | Cygnus atratus |
| Bộ | Anseriformes | Anseriformes |
| Họ | Anatidae | Anatidae |
| Tình Trạng Bảo Tồn | Critically Endangered | Least Concern |
| Chiều Dài | — | 130,0 cm (51.2 in) |
| Chiều Dài Sải Cánh | 39,7 cm (15.6 in) | 190,0 cm (74.8 in) |
| Khối Lượng | 465,25 g (16.41 oz) | 6200,0 g (218.70 oz) |
| Chế Độ Ăn | Dives for small fish, aquatic invertebrates, and amphibians; serrated bill grips prey; diet fish-heavy in … | Aquatic vegetation and algae, supplemented with grain and pasture grasses. Feeds by upending in shallow … |
| Số Trứng | 9-13 | 4-6 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Laysan Duck
Restricted to Laysan Island and Midway Atoll in the Hawaiian Islands. Inhabits the central hypersaline lagoon and surrounding vegetation. Feeds on brine shrimp and flies around the lagoon margin.
Black Swan
Lakes, rivers, swamps, and coastal waters across Australia. Also found in ornamental lakes in parks.
Song & Call Comparison
Laysan Duck
Female gives a soft, muffled quacking series; male utters a quiet rasp. Extremely rare; the soft, unobtrusive quacking calls are seldom heard on the remote Laysan Island lagoon.
Black Swan
Gives a musical bugling 'boo-boo-boo' in flight and softer honking on water. Less vocal than Mute Swan; produces a baying call when alarmed. Wings whistle softly in flight.
Geographic Range & Migration
Laysan Duck
Resident in West Africa from Senegal to Nigeria; inhabits rainforest streams and swamps. Sedentary and locally common.
Black Swan
Australia, primarily in the southeast and southwest. Introduced populations in New Zealand, Japan, and western Europe.
Tình Trạng Bảo Tồn
Laysan Duck
Black Swan
How to Tell Them Apart
Laysan Duck
Brown plumage mottled and streaked buff and dark brown. White eye-ring contrasts with dark face. Both sexes similar; females show reduced white eye ring. Iridescent speculum. Critically endangered; only on …
Black Swan
Almost entirely black with white flight feathers visible in flight. Red bill with a white band near the tip. Dark red to reddish-brown iris.
Bright red bill with a pale tip and prominent white band
About These Birds
Laysan Duck
A tiny brown dabbling duck with distinctive white around the eye and green speculum. The most range-restricted waterfowl in the world; endemic to Laysan Island in the Hawaiian archipelago. Critically Endangered; brought back from single digits in the early 20th century. Feeds on brine flies.
Black Swan
The black swan was once considered impossible by Europeans who believed all swans were white, making it a famous philosophical example of inductive reasoning failure. It is the state emblem of Western Australia. Black swans form lifelong pair bonds and both parents share in incubation and care of cygnets.