Little Bittern
Botaurus minutus
Uncommon to locally fairly common but secretive and easily overlooked. Favors fresh marshes and wetlands with reed beds, where clambers high in reeds as well as feeding low along edges. Most likely to be seen in flight, early or late in the day, low over reed beds. Very small for a heron, and rich buffy overall with black cap. Big pale panel on upperwing visible in flight; male has dark back, female back streaked.
识别特征
The little bittern has a length of 33–38 centimetres (13–15 in) and a wing span of 52–58 centimetres (20–23 in). It is the smallest of the breeding herons of Europe and is characterised by its tiny size, long and sharp bill and thick neck. The males are distinctively patterned and both sexes show pale forewing panels. The males have black with a faint green sheen on the crown, nape, back, tail and scapulars. The underparts are pale buff and the wing has a pinkish buff oval shaped panel which contrasts with the otherwise black wings and is formed by the inner wing coverts. The underwing is completely whiteish in colour. The female is duller than the male and has brownish black upperparts with paler feather margins visible at close range. The underparts of the female are not as clean as those of the male and are streaked with dark buff and brown. The female's wing panel is less obvious than the male's. The juveniles are duller and more rufous than the females and are more heavily streaked on both their upperparts and underparts, including their wing coverts.
分类信息
Carl Linnaeus described the little bittern in 1766. Member of a cosmopolitan superspecies with I. exilis (North and South America), I. sinensis (Asia) and I. dubius (New Guinea, AUS). I. [m.] minutus itself consists of three clearly differentiated subspecies (groups) to which all-species status could be assigned:<p>The Australian little bittern (I. dubius) and the extinct New Zealand little bittern (I. novaezelandiae) were formerly considered subspecies of the little bittern.<p>Comparative studies, especially on shouting / courtship behavior and genetics, are lacking.
- 学名
- Botaurus minutus
- 命名信息
- (Linnaeus, 1766)
- 目
- Pelecaniformes
- 科
- Ardeidae
- 属
- Botaurus
分布与栖息地
The little bittern is native to the Old World, breeding in Africa, central and southern Europe, western and southern Asia, and Madagascar. Birds from temperate regions in Europe and western Asia are migratory, wintering in Africa and further south in Asia, while those nesting in the tropics are sedentary. It is rare north of its breeding range.<p>In Britain there were intermittent reports of breeding in the nineteenth century, and again in 1946 and 1957, but none of these records were proven. The first proven British breeding record is from Yorkshire in 1984, and the second from the Avalon Marshes in Somerset in 2010, by 2017 this species had been present in this area for nine consecutive years.
- 迁徙
- Complete migrants
行为
The little bittern is crepuscular, skulking and normally solitary. It feeds on fishes, amphibians and insects which are caught within reedbeds or at their edges by the bird slowly stalking the prey. The male claims a territory in the Spring, advertising his presence with a deep barking or croaking call and the monogamous pair remain together for at least one breeding season. Eggs are laid in a nest situated in dense reedbeds, rushes or bushes above the water from the middle of May and there is a single brood which is normally 5-6 eggs. These are incubated for 17–19 days and the chicks are fledged after 25–30 days.<p>In Europe the little bittern is a migratory species, crossing the Mediterranean from Africa in the early Spring and arriving in their breeding wetlands from mid April onwards. The return to Africa occurs in August and September and there are normally only a few juveniles left in Europe by October. The European breeders migrate as far south as the Eastern Cape and Transvaal.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Savannah Sparrow
Passerculus sandwichensis
A medium-sized, short-tailed sparrow. Extensive plumage variation across range, but always streaky. Usually shows distinctive yellow patch in front of eye, but this can be indistinct or absent on some individuals. Some populations in California and Baja have larger bills and more muted gray streaking; others are very dark and boldly streaked. “Ipswich” Sparrow on the Atlantic Coast is paler with unique buffy-pinkish tones. Almost always found in open areas, from meadows and hayfields to tundra and coastal dunes. Tends to be found in more open habitats than Song Sparrow; also smaller and shorter-tailed.
Rufous-bellied Helmetshrike
Prionops rufiventris
A boldly patterned helmetshrike of lowland forests, often seen in small vocal groups. The bill is red and the head and chin are overall silvery gray. Has a black neck band and black wings, back, and tail. The chest is white and the belly, vent, and legs are reddish. Similar to the Red-billed Helmetshrike, with which it co-occurs locally in Cameroon, but Rufous-bellied Helmetshrike can be identified by its silvery gray chin and head (including below the eye) and the more extensive reddish coloration on its belly. Calls consist of liquid whistles and repeated grating “chew-two” calls.
Blue Malkoha
Ceuthmochares aereus
Odd, dark blue-and-gray cuckoo with a bright yellow bill. Found in thick habitats including forest, forest edge, and thickets. Skulks in the thickest parts of the mid-story, especially preferring vine tangles. Call starts with a hesitant series of high “kik” notes, eventually followed by a long, accelerating trill. Also gives a long up-and-down whistle. Dark coloration and yellow bill are distinctive. Range does not overlap with the similar Green Malkoha.
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