Black-headed Duck vs Ruddy Shelduck
Heteronetta atricapilla comparado con Tadorna ferruginea
Side-by-Side Comparison
| Atributo | Black-headed Duck | Ruddy Shelduck |
|---|---|---|
| Nombre científico | Heteronetta atricapilla | Tadorna ferruginea |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 34,7 cm (13.7 in) | 71,1 cm (28.0 in) |
| Peso | 528,5 g (18.64 oz) | 1318,3333333333333 g (46.50 oz) |
| Dieta | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Feeds on seeds, plant material, and aquatic invertebrates; dabbles in wetlands; diet varies between seasons … |
| Tamaño de la puesta | 2 | 8-16 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Black-headed Duck only
Ninguno
Ruddy Shelduck only
Ninguno
Ruddy Shelduck
Steppe lakes, river valleys, inland saline and freshwater wetlands from southeastern Europe and North Africa east through Central Asia to China and Mongolia. Winters on lakes and rivers in South and Southeast Asia.
Song & Call Comparison
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.
Ruddy Shelduck
A loud, resonant bugling 'aakh' from males; females give a rapid cackling 'kak-kak-kak'. Call carries far across open Asian steppe and river valleys.
Geographic Range & Migration
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.
Ruddy Shelduck
Breeds in wetlands across Eurasia; winters from sub-Saharan Africa to South and Southeast Asia. Broad wintering distribution.
Estado de conservación
Black-headed Duck
Ruddy Shelduck
How to Tell Them Apart
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.
Ruddy Shelduck
Warm orange-rufous overall plumage; paler buffy head. Males have narrow black neck collar in breeding season. Black tail and primaries. White wing coverts and iridescent green speculum visible in flight. …
About These Birds
Black-headed Duck
El pato cabeza negra es un pequeño pato buceador (~530 g) de América del Sur, familia Anatidae, y el único miembro del género Heteronetta. Tiene la cabeza negra en el macho y cuerpo marrón. Parásita de nido obligada: pone sus huevos en los nidos de otras aves acuáticas, especialmente fochas y pollas de agua. Habita en lagos y lagunas con vegetación emergente de Argentina, Bolivia, Brasil, Chile, Paraguay y Uruguay. No cría su propia cría nunca.
Ruddy Shelduck
El tarro canelo es un grande y vistoso pato de color canela-naranja brillante con la cabeza más pálida y las alas con marcas negras y blancas en vuelo. Está ampliamente distribuido desde el norte de África y el sur de Europa hasta Asia central y China, con una población disyunta en Etiopía. Habita en lagos, ríos y pantanos en zonas montañosas y semiáridas.