Laysan Duck vs Greater White-fronted Goose
Anas laysanensis 对比 Anser albifrons
Side-by-Side Comparison
| 属性 | Laysan Duck | Greater White-fronted Goose |
|---|---|---|
| 学名 | Anas laysanensis | Anser albifrons |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Critically Endangered | Least Concern |
| 体长 | — | — |
| 翼展 | 39.7 cm (15.6 in) | 81.6 cm (32.1 in) |
| 体重 | 465.25 g (16.41 oz) | 2471.0 g (87.16 oz) |
| 食性 | -- | Dabbles for aquatic invertebrates, seeds, and plant material; diet shifts heavily toward invertebrates in breeding … |
| 产卵数 | 9-13 | 3-9 |
| Population Trend | — | — |
Habitat Comparison
Laysan Duck
Restricted to Laysan Island and Midway Atoll in the Hawaiian Islands. Inhabits the central hypersaline lagoon and surrounding vegetation. Feeds on brine shrimp and flies around the lagoon margin.
Greater White-fronted Goose
Breeds on Arctic and subarctic tundra and peatlands. Winters on estuaries, agricultural fields, freshwater marshes, and flooded meadows across Europe, Asia, and North America. One of the most widespread geese.
Song & Call Comparison
Laysan Duck
Female gives a soft, muffled quacking series; male utters a quiet rasp. Extremely rare; the soft, unobtrusive quacking calls are seldom heard on the remote Laysan Island lagoon.
Greater White-fronted Goose
A loud, laughing 'kow-lyuk' or musical 'wah-wah'. Gives a distinctive high-pitched yodeling quality lacking in Greylag. Highly vocal in large winter flocks.
Geographic Range & Migration
Laysan Duck
Greater White-fronted Goose
Breeds in the potholes region of the northern Great Plains; winters in the southern United States and along the Gulf Coast.
保护状况
Laysan Duck
Greater White-fronted Goose
How to Tell Them Apart
Laysan Duck
Brown plumage mottled and streaked buff and dark brown. White eye-ring contrasts with dark face. Both sexes similar; females show reduced white eye ring. Iridescent speculum. Critically endangered; only on …
Greater White-fronted Goose
Brown-gray body with white forehead patch bordered by white band at bill base. Underparts with bold irregular black bars on belly. Orange bill; orange-yellow legs. Juveniles lack white front and …
About These Birds
Laysan Duck
莱岛鸭是世界上最濒危的鸭类之一，仅分布于夏威夷莱岛群岛的莱桑岛。这种小型鸭子由于长期与世隔绝，几乎完全失去了飞行能力。其种群曾一度减少至仅约12只，经过保护努力数量有所恢复。它主要以昆虫、无脊椎动物和藻类为食，面临外来物种入侵的严峻威胁。
Greater White-fronted Goose
A medium-large goose with a white forehead patch, orange bill, grey-brown plumage, and variable black barring on the belly. Widespread and numerous; one of the most abundant geese in the world. Breeds across the high Arctic; winters in a wide range of temperate wetland and agricultural habitats.