Spotted Whistling-Duck
Dendrocygna guttata
Small whistling-duck with strongly pale-spotted neck and flanks, dark bill, and gray face. Similar to Wandering Whistling-Duck, but lacks warm rusty coloring, and has pale-spotted rather than dark-spotted breast. Found in small flocks in coastal wetlands and lagoons. Australia range slowly expanding southwards from Cape York region, with regular records now from the Wet Tropics.
识别特征
The Spotted whistling duck is one of the smaller species in the genus Dendrocygna. This duck grows to 43–50 cm tall. Males can weigh anywhere from 590g to 650g while females weigh 610g to 860g. White spots on their flanks and breasts gave these ducks the spotted name. The sides of the neck, faces, and eyebrows are all grey. Black or dark brown coloring stretches from the crown nape to the hindneck. This dark coloring is also found in the eyepatch. Their coloring resembles a cape with a thick collar. This cape starts as a light brown then fades into a darker brown closer to the tail. Their underbelly is mostly brown, sometimes spotted, and significantly lighter than the wings and the “collar.” A white bar on the upper tail coverts can be seen during flight aiding in identification. They have dull pink legs with black webbed feet and sharp nails. The bill is dark, yet often seen with portions of red and a small white mark on the lower mandible. Spotted whistling ducks look as though they are raised from the ground, as though they are standing up tall. (look more into this). Their wings pressed strongly against the body. Inner vanes of the outer primaries are jagged and can be seen in flight (check on this). While flying, the head is positioned down causing the whole bird to look hunched. The tail stays pointed and looks long when in flight. Juveniles are seen with white streaks on flanks instead of spots and have significantly duller coloring. Spotted whistling ducks are visually similar to D. arborea, yet many scientists believe its closest relative is D. eytoni. After gaining their adult plumage at the age of 6 months,. the spotted whistling duck has a single annual molt. Like other ducks, swans, and geese, the spotted whistling duck molts synchronously. Synchronous molting is common within Anseriformes because waterfowl have the ability to avoid terrestrial predators. Unlike other birds, waterfowl float in ponds lakes while they molt, safe from predators. Other more evolved ducks have two molts, whistling ducks only molt once.
分类信息
Genus: Dendrocygna; Family: Anatidae; Order: Anseriformes.
- 学名
- Dendrocygna guttata
- 命名信息
- Schlegel, 1866
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Dendrocygna
分布与栖息地
Whistling ducks are found all over the world. The spotted whistling duck is distributed throughout the Philippines, Australia, and New Guinea. These ducks live in the southern part of the Philippines and several islands of Indonesia. In Indonesia spotted whistling ducks stretch from the Eastern Lesser Sundas islands to new guinea. Spotted whistling ducks are also found in Weipa and Iron ranges of Australia, but have also been seen at Wonga Beach. Scientists hypothesize the Indonesian population was introduced due to a storm blowing the birds off course. Spotted whistling ducks live around bodies of water, like many other ducks. These ducks specifically live around small ponds and marshes surrounded by trees. They prefer humid and low altitude habitats. Spotted whistling ducks build hollows within the trees surrounding their habitats.
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Black-tailed Trogon
Trogon melanurus
Large trogon with a red belly and stout yellow bill. The female has a gray head and chest, while the male is emerald green with a white band separating the chest from its red belly. Note the plain dark gray undertail. Found in canopy and middle levels of lowland forest, mainly in the Amazon basin of northern South America but also in eastern Panama, northern Colombia, and western Venezuela. The similar Slaty-tailed Trogon has a red bill and males lack the white chest band seen on Black-tailed Trogons. Listen for slow series of low-pitched “coop” calls.
Mangrove Hummingbird
Chrysuronia boucardi
This restricted species is found only along the Pacific coast of Costa Rica, most often in or near mangrove trees. Medium-sized hummingbird. Male has a glittering blue-green head and throat contrasting with a whitish belly. The base of the bill is red. Female is greenish above with mostly white underparts; note her dark forked tail.
Yellow-bellied Flowerpecker
Pachyglossa melanozantha
Snappy-looking male is black with a white throat and yellow belly. Two black patches on either side of the chest give him a “vested” appearance. Female is soft brown above with a darker tail and wingtips, and a pale-yellow belly which blends gradually into the breast. The female also has a vest, but it is fainter and less eye-catching than the male’s. Found from lower foothills up into montane areas, where it inhabits open areas with tall growth, particularly edges and clearings. Like other flowerpeckers, favors mistletoe.
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