Mallard vs Brazilian Merganser
Anas platyrhynchos comparado com Mergus octosetaceus
Side-by-Side Comparison
| Atributo | Mallard | Brazilian Merganser |
|---|---|---|
| Nome científico | Anas platyrhynchos | Mergus octosetaceus |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Critically Endangered |
| Comprimento | 58,0 cm (22.8 in) | — |
| Envergadura | 90,0 cm (35.4 in) | 39,2 cm (15.4 in) |
| Peso | 1100,0 g (38.80 oz) | 827,6666666666666 g (29.20 oz) |
| Dieta | Omnivorous — aquatic plants, seeds, insects, crustaceans, and mollusks. Feeds by dabbling, upending, and grazing … | Dives for small fish in fast-flowing South American rivers. Critically endangered; uses serrated bill to … |
| Tamanho da postura | 4-18 | 5-8 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Mallard
Nearly any wetland habitat including lakes, rivers, ponds, marshes, estuaries, and urban park ponds.
Song & Call Comparison
Mallard
Female gives the classic 'quack-quack-quack', descending in pitch. Male utters soft nasal 'raeb-raeb'. Both give a high 'gag-gag-gag' when alarmed or taking flight.
Brazilian Merganser
Male produces a harsh, rasping call; female gives a guttural, grunting series. Critically endangered; quiet vocalizations suit its secretive lifestyle in fast-flowing Brazilian mountain rivers.
Geographic Range & Migration
Mallard
Native across the Northern Hemisphere in North America, Europe, and Asia. Introduced to Australia and New Zealand.
Brazilian Merganser
Critically endangered; restricted to a few rivers in southern Brazil, Argentina, and Paraguay. Found on fast-flowing rivers in Atlantic Forest.
Estado de conservação
Mallard
Brazilian Merganser
How to Tell Them Apart
Mallard
Breeding males have an iridescent green head, white neck ring, chestnut breast, and grey body. Females are mottled brown. Both sexes show a blue speculum bordered by white.
Broad, flat bill — yellow-green in males, orange-brown in females
Brazilian Merganser
Male has dark glossy greenish-black head with long shaggy crest; finely vermiculated grey body, white wing patch. Female similar but with rufous-chestnut wash on head and shorter crest.
About These Birds
Mallard
The mallard is the ancestor of most domestic duck breeds and the most abundant and widespread dabbling duck in the world. Males perform elaborate courtship displays including head-bobbing and whistle-grunt calls. Mallards are highly adaptable, thriving in both wilderness and urban environments.
Brazilian Merganser
O merganso-brasileiro é um pato mergulhador criticamente ameaçado endémico do Brasil, com populações remanescentes muito pequenas também na Argentina e Paraguai. É um dos patos mais raros do mundo. Os machos têm cabeça e pescoço verde escuro iridescente e peito branco. Habita rios de montanha de correnteza rápida com margens rochosas em florestas de mata atlântica e cerrado. As ameaças incluem poluição, degradação de habitat e perturbação.