Madagascar Pochard vs Brent Goose
Aythya innotata comparado con Branta bernicla
Side-by-Side Comparison
| Atributo | Madagascar Pochard | Brent Goose |
|---|---|---|
| Nombre científico | Aythya innotata | Branta bernicla |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Critically Endangered | Least Concern |
| Longitud | — | — |
| Envergadura | 37,4 cm (14.7 in) | 63,9 cm (25.2 in) |
| Peso | 685,0 g (24.16 oz) | 1335,0 g (47.09 oz) |
| Dieta | Eats molluscs, crustaceans, and aquatic invertebrates; dives in shallow coastal and freshwater habitats. | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| Tamaño de la puesta | 6-10 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Madagascar Pochard only
Ninguno
Brent Goose only
Madagascar Pochard
Restricted to Lake Matsaborimena in the highlands of northern Madagascar at about 1,500 m altitude. Uses deep-water mountain lakes with aquatic vegetation. Critically Endangered; tiny wild population.
Brent Goose
Breeds on high-Arctic tundra; winters on estuaries, coastal mudflats, saltmarshes, and sea-grass beds along Atlantic and Pacific coastlines. One of the most strictly coastal wintering geese.
Song & Call Comparison
Madagascar Pochard
Critically Endangered; produces a soft, Aythya-like purring and grating quacking. Calls are not well-documented; likely similar to closely related Ferruginous Duck based on phylogeny.
Brent Goose
A low, guttural 'rronk' or 'ronk-ronk' from flocks. Soft nasal calls in feeding groups. A subtle, understated call for a goose — less loud than most Anser geese.
Geographic Range & Migration
Madagascar Pochard
Breeds across the northern boreal zone of Canada and Alaska; winters along the Pacific and Atlantic coasts of North America.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Estado de conservación
Madagascar Pochard
Brent Goose
How to Tell Them Apart
Madagascar Pochard
Males have brown head and neck; dark brown back; pale gray flanks with white undertail. White eye. Blue-gray bill. Females browner with pale face patch and brown eye. Critically endangered; …
Brent Goose
Small; mostly black head, neck, and breast. Small white neck-patch on adults. Back dark brownish-gray; belly pale gray to white depending on subspecies. White undertail coverts. Sexes similar.
About These Birds
Madagascar Pochard
El porrón de Madagascar es una especie muy rara considerada probablemente extinta hasta su redescubrimiento en 2006 en el lago Alaotra de Madagascar. Tiene plumaje similar al del porrón pardo, pero el macho tiene el ojo oscuro. Es el ave más rara del mundo, con solo unos pocos individuos conocidos en vida silvestre, siendo el resultado de décadas de intensos esfuerzos de conservación.
Brent Goose
El barnacla brenta o barnacla negruzca es un pequeño ganso marino de color negro y gris oscuro con un pequeño parche blanco a los lados del cuello. Cría en la tundra ártica y migra a zonas costeras templadas del hemisferio norte en invierno, donde se alimenta principalmente de zostera, un tipo de hierba marina. Es el único ganso que pasa el invierno en ambientes exclusivamente marinos.