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For example, the white-faced whistling ducks with more black coloration are commonly found in western Africa where rainfall supersedes the dry season. The back and wings are dark brown to black, and the underparts are black with a fine white barring on the flanks. The neck is chestnut. Males and females have similar plumage.
In summer, the male is dark on the head, neck and back with a white cheek patch. The female has a brown back and a relatively short pointed tail. In winter, the female's head and neck are white with a dark crown. In summer, the head is dark. Juveniles resemble adult females in autumn plumage, though with a lighter, less distinct cheek patch.
In summer, it has a rich chestnut body with a bright blue bill. In winter, it is a dull gray-brown above and paler below with a dull gray bill. The female and first-year male are brownish, somewhat like the winter male but with a blurry stripe across the pale cheek patch. In flight, the ruddy duck shows the solidly dark tops of the wings. [8]
The face and upper neck are gray, and they sport a thin but distinct white eye-ring. The extensive white in the wings is obvious in flight, less so on the ground; it is formed by the secondary remiges while the primaries are black; the wing coverts are brown. Males and females look alike; juveniles are similar but have a gray bill and less ...
The bird is predominantly black, with large white patches on the wing; the back feathers being iridescent and glossy in males, while the females are more drab. Although the Muscovy duck is a tropical bird, it adapts well to cooler climates, thriving in weather as cold as −12 °C (10 °F) and able to survive even colder conditions.
West Indian whistling duck: Dendrocygna arborea (Linnaeus, 1758) 4 Fulvous whistling duck: Dendrocygna bicolor (Vieillot, 1816) 5 Plumed whistling duck: Dendrocygna eytoni (Eyton, 1838) 6 Wandering whistling duck: Dendrocygna arcuata (Horsfield, 1824) 7 Lesser whistling duck: Dendrocygna javanica (Horsfield, 1821) 8 White-backed duck ...
What are symptoms? Strep throat symptoms can include: Fever. Pain when swallowing. Sore throat that starts quickly and may look red. Red and swollen tonsils. White patches or streaks of pus on the ...
The white-backed duck (Thalassornis leuconotus) is a waterbird of the family Anatidae. It is distinct from all other ducks, but most closely related to the whistling ducks in the subfamily Dendrocygninae, though also showing some similarities to the stiff-tailed ducks in the subfamily Oxyurinae. It is the only member of the genus Thalassornis.