Grey Teal vs Brent Goose
Anas gracilis в сравнении с Branta bernicla
Side-by-Side Comparison
| Характеристика | Grey Teal | Brent Goose |
|---|---|---|
| Научное название | Anas gracilis | Branta bernicla |
| Отряд | Anseriformes | Anseriformes |
| Семейство | Anatidae | Anatidae |
| Охранный статус | Least Concern | Least Concern |
| Длина | — | — |
| Размах крыльев | 38,4 cm (15.1 in) | 63,9 cm (25.2 in) |
| Масса | 504,25 g (17.79 oz) | 1335,0 g (47.09 oz) |
| Питание | Dives for molluscs, crustaceans, and aquatic invertebrates in shallow coastal and freshwater habitats; diet dominated … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| Размер кладки | 7-8 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Grey Teal
Freshwater and saline wetlands across Australia and New Zealand, including temporary pans, lakes, rivers, and estuaries. Highly nomadic in Australia following unpredictable rainfall. Less nomadic in New Zealand.
Brent Goose
Breeds on high-Arctic tundra; winters on estuaries, coastal mudflats, saltmarshes, and sea-grass beds along Atlantic and Pacific coastlines. One of the most strictly coastal wintering geese.
Song & Call Comparison
Grey Teal
Female gives a high, nasal descending quacking series; male produces a soft, piping whistle. The high-pitched quacking call is distinctive; flocks create a musical chattering on Australian wetlands.
Brent Goose
A low, guttural 'rronk' or 'ronk-ronk' from flocks. Soft nasal calls in feeding groups. A subtle, understated call for a goose — less loud than most Anser geese.
Geographic Range & Migration
Grey Teal
Breeds across northern North America in boreal and sub-Arctic zones; winters on both coasts and inland waters of the US.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Охранный статус
Grey Teal
Brent Goose
How to Tell Them Apart
Grey Teal
Pale gray-brown body finely spotted and scaled dark. Head pale gray-buff with fine dark spots. Red eye. White throat. Iridescent green speculum with white front border. Gray bill; gray legs. …
Brent Goose
Small; mostly black head, neck, and breast. Small white neck-patch on adults. Back dark brownish-gray; belly pale gray to white depending on subspecies. White undertail coverts. Sexes similar.
About These Birds
Grey Teal
A small grey-brown teal with fine pale edging on feathers, red eye, and green speculum. Widespread and common in Australia and New Zealand. Highly nomadic in Australia; follows inland flooding. Found in a wide variety of freshwater habitats from permanent lakes to temporary claypans.
Brent Goose
A small dark-bodied goose with a black head and neck, small white neck patches, and pale grey belly. Migrates between high-Arctic breeding grounds and temperate coastal wintering areas. Feeds on eel-grass and saltmarsh vegetation in winter. Three subspecies differ in belly coloration.