Tree Martin
Petrochelidon nigricans
Small swallow dark above, pale below, with grayish rump and notched tail. Call is a pleasant twittering, unlike harsh call of Fairy Martin, which has paler rump and rusty crown. Found throughout Australia in many habitats, including urban areas.
识别特征
The tree martin averages 13 cm (5.1 in) in length and has a shallowly forked tail. The adult has an iridescent blue back and crown, brown wings and tail, a rufous forehead and a whitish rump. The underparts are white. The sexes are similar, but young birds are duller and browner, with a paler forehead and pale fringes to the back and wing feathers.<p>The call of this vocal swallow is a tsweet and the song is a high-pitched twitter.<p>This species can be distinguished from other Australian swallows by its tail shape and pale rump. The most similar species, the fairy martin, has a rufous head and nape.
分类信息
The tree martin was formally described in 1817 by the French ornithologist Louis Vieillot under the binomial name Hirundo nigricans. The specific epithet is Latin meaning "blackish". Vieillot gave the type locality as "Nouvelle-Hollande" (New South Wales) but this has been corrected to Hobart, Tasmania. The tree martin is now one of ten swallows placed in the genus Petrochelidon that was introduced in 1851 by the German ornithologist Jean Cabanis.<p>Three subspecies are recognised:
- 学名
- Petrochelidon nigricans
- 命名信息
- (Vieillot, 1817)
- 目
- Passeriformes
- 科
- Hirundinidae
- 属
- Petrochelidon
分布与栖息地
- 迁徙
- Complete migrants
行为
Tree martins breed, depending on region, from July through to January, either in pairs or semi-colonially depending on nest site availability. Nests are constructed in natural holes in dead trees or rock crevices, but increasingly in artificial sites on bridges and buildings. This is most common in western Australia, where breeding occurs even in large cities like Adelaide and Perth. Tree martins also occasionally reline the nests of welcome swallows, and may displace the owners to obtain the nest.<p>The nest, unusually for a cliff swallow, is often made just from grass and leaves, but may be reinforced with mud. A mud and plant fibre cement is also used to reduce the width of the entrance to the breeding hole. The clutch is 3–5, usually four, brown and mauve-spotted white eggs, and this species is often double-brooded.<p>Tree martins have a fast twisting flight and feed higher than welcome swallows, often more than 6 m above the ground. They are frequently seen above the canopy of tall eucalyptus trees catching aerial insects, but will also feed on insect swarms low over water. This species can be highly gregarious when not breeding, and will form mixed flocks with fairy martins.<p>
保护状况
- 种群趋势
- rising
照片
分布
鸟叫声
其他鸟类
Junin Tapaculo
Scytalopus gettyae
Poorly known Peruvian endemic found only in high Andean cloud forest northeast of the city of Huancayo. It was described to science in 2013. Adult male is plain gray, lacking the rufous barring on the lower underparts shown by Rufous-vented Tapaculo and Trilling Tapaculo. Female plumage not yet known with certainty. Younger birds are heavily marked with bars or scales. Best identified by range and voice. Typical song is a lengthy series that starts out with simple notes and gradually transitions into sputtering bursts.
Preuss's Weaver
Ploceus preussi
A yellow-and-black weaver with a distinctive golden-chestnut crown and a yellow back that extends to the upper tail. The forehead of the male is golden-chestnut, while that of the female is black. Juvenile has a yellow-olive head and a pale bill. An uncommon resident in primary and secondary forest, often joining mixed-species flocks and clambering along tree trunks like a nuthatch. Often found in pairs. Mostly silent, but a harsh “chwep” call has been recorded. Yellow-capped Weaver is similar to Preuss’s but has a dark lower back and rump and does not creep along branches and trunks; Brown-capped Weaver has a dark crown and prefers the mountains.
Pigeon Guillemot
Cepphus columba
Small jet-black seabird of coastal areas of the Pacific. Breeding plumage is black with bold white wing patch and bright red legs. Plumage changes dramatically in winter to whitish overall with dusky markings on body and black wingtips. Often found in shallower coastal waters than other alcids and regularly seen from shore. Dives to hunt for fish and invertebrates. Nests in crevice or burrow in a cliff or around large rocks.
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