Mauritius Duck vs Black-headed Duck
Anas theodori в сравнении с Heteronetta atricapilla
Side-by-Side Comparison
| Характеристика | Mauritius Duck | Black-headed Duck |
|---|---|---|
| Научное название | Anas theodori | Heteronetta atricapilla |
| Отряд | Anseriformes | Anseriformes |
| Семейство | Anatidae | Anatidae |
| Охранный статус | Extinct | Least Concern |
| Длина | — | — |
| Размах крыльев | — | 34,7 cm (13.7 in) |
| Масса | — | 528,5 g (18.64 oz) |
| Питание | Extinct; fed on freshwater invertebrates and aquatic plants; diet inferred from bill morphology and contemporary … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| Размер кладки | -- | 2 |
| Population Trend | — | — |
Habitat Comparison
Общие среды обитания
Нет
Mauritius Duck only
Black-headed Duck only
Mauritius Duck
Historically restricted to the Mascarene Islands (Mauritius and Réunion) in the Indian Ocean. Now extinct. Presumably inhabited freshwater wetlands and coastal areas before human colonization.
Song & Call Comparison
Mauritius Duck
Extinct (EX). No recordings exist. As a small island Anas duck, likely produced a quiet quacking call. Closest living relatives among insular Indian Ocean teals give soft, nasal notes.
Black-headed Duck
Male gives a soft, raspy peeping note; female produces a muted quack. An obligate brood parasite with reduced vocalizations; subdued calls suit its secretive lifestyle among Argentine reeds.
Geographic Range & Migration
Mauritius Duck
Breeds in Arctic tundra ponds of Canada; winters along the Atlantic and Gulf coasts of the southern United States.
Black-headed Duck
Resident in southern South America from southern Brazil and Bolivia south to Argentina and Chile. Found on lakes and marshes in open lowlands.
Охранный статус
Mauritius Duck
Black-headed Duck
How to Tell Them Apart
Mauritius Duck
Extinct Mascarene duck known only from subfossil bones. Plumage unrecorded; presumably brown dabbling duck plumage typical of Anas. Likely flightless or near-flightless; extirpated after European settlement of Mauritius.
Black-headed Duck
Male has distinctive jet-black head and neck, warm chestnut-brown back, and pale buff underparts; blue-grey bill with red base. Female is streaked brown above with pale supercilium and whitish underparts.
About These Birds
Mauritius Duck
An extinct duck known from subfossil bones found on Mauritius and Réunion. Closely related to the Grey Teal. Went extinct after European settlement of the Mascarene Islands in the 17th century due to hunting and introduced predators.
Black-headed Duck
A small diving duck (~530 g) of South America, family Anatidae, and the sole member of genus Heteronetta. Inhabits freshwater marshes and lakes in Argentina, Bolivia, Brazil, Chile, and Uruguay. Unique among waterfowl as an obligate brood parasite, laying eggs in nests of coots and other waterbirds. Feeds on seeds and aquatic invertebrates. Least Concern.