African Black Duck vs Hawaiian Goose
Anas sparsa comparado con Branta sandvicensis
Side-by-Side Comparison
| Atributo | African Black Duck | Hawaiian Goose |
|---|---|---|
| Nombre científico | Anas sparsa | Branta sandvicensis |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Near Threatened |
| Longitud | — | — |
| Envergadura | 49,5 cm (19.5 in) | 72,8 cm (28.7 in) |
| Peso | 996,8333333333334 g (35.16 oz) | 2150,0 g (75.84 oz) |
| Dieta | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet heavier in … | Eats aquatic plants, algae, and grasses; upends in shallow water to graze submerged vegetation; diet … |
| Tamaño de la puesta | 4-9 | 1-6 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Ninguno
African Black Duck only
Hawaiian Goose only
African Black Duck
Fast-flowing rocky rivers and streams, mountain gorges, and waterfalls from sea level to 4,000 m across sub-Saharan Africa from Ethiopia and Kenya south to the Cape. Requires clear turbulent water with boulders.
Hawaiian Goose
Volcanic slopes, lava flows, coastal grasslands, and shrublands on Maui, Hawai'i, and Kauai. Adapted to rocky terrain with reduced toe webbing. Introduced to other Hawaiian islands. Avoids dense forest.
Song & Call Comparison
African Black Duck
Produces a harsh, resonant quacking call; alarm is a loud, emphatic quack repeated rapidly. Both sexes call with strong quacking; pairs duet with synchronized calls along African rivers.
Hawaiian Goose
A soft, low 'moo-moo' — the murmuring call gives the Nene its Hawaiian name. Also gives honking calls in flight. Less vocal than Canada Goose; distinctive murmuring quality.
Geographic Range & Migration
African Black Duck
Resident across South and Southeast Asia, from India to southern China and the Philippines. Non-migratory in most of its range.
Hawaiian Goose
Breeds in sub-Arctic Canada; winters on large lakes and rivers from the Gulf of Mexico north to where water remains open.
Estado de conservación
African Black Duck
Hawaiian Goose
How to Tell Them Apart
African Black Duck
Dark blackish-brown plumage with bold white spots on back and scapulars. Iridescent blue-green speculum with white borders. Head dark with pale spots. Bill and legs dark gray. Sexes similar. Fast-flowing …
Hawaiian Goose
Buff-tan neck with black and white channeled furrows. Crown and face black; hindneck black. Body gray-brown above; underparts pale with buff breast. Reduced webbing on feet. Sexes similar. State bird …
About These Birds
African Black Duck
El pato africano moteado es un pato de tamaño mediano de color marrón oscuro con motas blancas en el pecho y los flancos. Habita en ríos de rápido caudal, cascadas y arroyos de montaña en África central y meridional, siendo inusual entre los patos por su preferencia por aguas corrientes y turbulentas. También se encuentra en altitudes elevadas en las zonas montañosas de África oriental.
Hawaiian Goose
El ganso hawaiano o nene es el ganso endémico de las islas hawaianas y el ave oficial del estado de Hawaii. Tiene las patas con los dedos en parte sin membrana, lo que es una adaptación para caminar sobre las lavas volcánicas. Estuvo casi extinguido a mediados del siglo XX con sólo 30 individuos supervivientes, pero se ha recuperado gracias a la cría en cautiverio y la reintroducción.