Greater Scaup vs Black-headed Duck
Aythya marila comparado con Heteronetta atricapilla
Side-by-Side Comparison
| Atributo | Greater Scaup | Black-headed Duck |
|---|---|---|
| Nombre científico | Aythya marila | Heteronetta atricapilla |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 42,7 cm (16.8 in) | 34,7 cm (13.7 in) |
| Peso | 984,0 g (34.71 oz) | 528,5 g (18.64 oz) |
| Dieta | Eats molluscs, crustaceans, and aquatic invertebrates in coastal and freshwater habitats; diet shifts between invertebrate … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| Tamaño de la puesta | 4-12 | 2 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Greater Scaup only
Black-headed Duck only
Ninguno
Greater Scaup
Breeds on tundra and boreal lakes in the Arctic and subarctic across Eurasia and North America. Winters in large numbers on coastal bays, estuaries, and large lakes in temperate regions.
Song & Call Comparison
Greater Scaup
Male gives a low, purring wheeze; female produces a harsh, rolling quacking sequence. Calls are very similar to Lesser Scaup but slightly lower-pitched; heard on open ocean bays in winter.
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
Greater Scaup
Breeds in the high Arctic of North America; winters offshore on the Atlantic coast from Labrador to South Carolina.
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.
Estado de conservación
Greater Scaup
Black-headed Duck
How to Tell Them Apart
Greater Scaup
Males have glossy green-black rounded head; white flanks and belly; black breast and undertail; gray back. Yellow eye. Bill blue-gray. Females dark brown with white face patch around bill. Longer …
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
Greater Scaup
El porrón bastardo o porrón de Islandia es un gran pato buceador que cría en la tundra y la taiga del norte de Europa, Asia y América del Norte. El macho tiene la cabeza verde-negro iridiscente, el pecho negro y los flancos y el dorso de color blanco grisáceo. Inverna en costas, bahías y estuarios, siendo muy tolerante a las condiciones marinas de agua salada.
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.