Campbell Teal vs American Black Duck
Anas nesiotis в сравнении с Anas rubripes
Side-by-Side Comparison
| Характеристика | Campbell Teal | American Black Duck |
|---|---|---|
| Научное название | Anas nesiotis | Anas rubripes |
| Отряд | Anseriformes | Anseriformes |
| Семейство | Anatidae | Anatidae |
| Охранный статус | Vulnerable | Least Concern |
| Длина | — | — |
| Размах крыльев | 24,4 cm (9.6 in) | 53,4 cm (21.0 in) |
| Масса | 358,75 g (12.65 oz) | 1211,25 g (42.73 oz) |
| Питание | Eats molluscs, crustaceans, and aquatic invertebrates in coastal and freshwater habitats; diet varies with season. | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … |
| Размер кладки | 5-6 | 1-17 |
| Population Trend | — | — |
Habitat Comparison
Общие среды обитания
Campbell Teal only
Campbell Teal
Restricted to Campbell Island and Dent Island in the subantarctic New Zealand group. Dense tussock grassland, rocky shores, and freshwater streams. Nocturnal or crepuscular. Highly sedentary.
American Black Duck
Freshwater and brackish wetlands in eastern North America from Atlantic Canada south along the coast to Georgia. Breeds in northern bogs and wetlands. Winters on coastal marshes, estuaries, and freshwater lakes.
Song & Call Comparison
Campbell Teal
Female produces a very soft quacking note; male gives a faint squeak. Near-silent; rarely vocalizes; the reduced call apparatus mirrors the species' severely limited wingspan and near-flightlessness.
American Black Duck
Female produces a loud, deep quacking series; male gives a low, raspy grunt. Voice is deeper and huskier than a Mallard; pairs call powerfully across northeastern North American wetlands.
Geographic Range & Migration
Campbell Teal
Breeds in sub-Arctic freshwater lakes of Canada; winters along the Pacific coast from Alaska to Baja California.
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Охранный статус
Campbell Teal
American Black Duck
How to Tell Them Apart
Campbell Teal
Very dark brown plumage; males have iridescent green head gloss and white eye-ring. Females dark brown with white eye-ring. Flightless; tiny vestigial wings. Recovered from near-extinction on Campbell Island, New …
American Black Duck
Sooty dark brown body; head and neck paler buff with dark streaking. Iridescent purple speculum without white border. Males have yellow-green bill; females olive with orange blotches. Silvery underwings in …
About These Birds
Campbell Teal
A tiny flightless teal with dark brown plumage in females and males with greenish-black head. Endemic to Campbell Island, New Zealand. Nearly extinct; reintroduced after eradication of Norway rats from the island. Nocturnal; feeds on invertebrates at freshwater sources.
American Black Duck
A large dark brown dabbling duck closely resembling a very dark female Mallard, with purple speculum, yellowish-olive bill in males, and orange legs. Common in eastern North America. Hybridizes freely with Mallard; pure populations declining in the interior.