Yucatan Gnatcatcher
Polioptila albiventris
Tiny gray and white bird with cocked tail. Local in dry tropical scrub of northern Yucatan Peninsula. Male has a black cap, solid in breeding season, but with narrow white eyebrow in non-breeding season. Female has gray cap with narrow white eyebrow year-round. Told from Blue-gray Gnatcatcher by face pattern: Blue-gray has a white eyering, not a white brow.
识别特征
The Yucatan gnatcatcher is 10 to 12 cm (3.9 to 4.7 in) long. Six males weighed 5.4 to 6.2 g (0.19 to 0.22 oz) and three females 5.0 to 5.7 g (0.18 to 0.20 oz). The female's upperparts are plumbeous gray from the crown to the rump. Its underparts are white with sometimes a pale grayish wash on the flanks. The tail's central feathers are black and each pair out from them are progressively more white until the all white outermost pair. It has a narrow white supercilium. The male's basic (non-breeding) plumage is essentially the same. Its alternate (breeding) plumage is also similar with the addition of a black cap that extends to the middle of its eye.
分类信息
The Yucatan gnatcatcher is monotypic. <p>"The continually changing species to which albiventris has been allied gives testament to the general confusion that has afflicted the classification of most Central American Polioptila taxa." It was originally described as a full species. It was later variously considered a subspecies of tropical gnatcatcher (P. plumbea), black-capped gnatcatcher (P. nigriceps), and "white-browed" gnatcatcher (P. plumbea bilieata) during its time as a separate species. It was most recently considered a subspecies of the white-lored gnatcatcher (P. albiloris) until a 2018 molecular study showed significant differences from all other gnatcatchers.
- 学名
- Polioptila albiventris
- 命名信息
- Lawrence, 1885
- 目
- Passeriformes
- 科
- Polioptilidae
- 属
- Polioptila
分布与栖息地
The Yucatan gnatcatcher is found only on the northern coast of Mexico's Yucatan Peninsula. Its primary habitat is arid coastal scrub, and it also occurs in low deciduous woodlands and coastal mangroves. Most observations are within 50 km (31 mi) of the ocean where the maximum elevation appears to be approximately 200 m (660 ft).
行为
No information on the Yucatan gnatcatcher's diet or feeding technique has been published, but in common with others of its genus, "its diet is presumed to consist largely of small invertebrates gleaned from foliage or captured with short sallies."<p>Though nothing has been published about the Yucatan gnatcatcher's breeding phenology, some information has been gleaned from publicly posted photographs. The nest is a small cup of plant fibers, built by both sexes, and placed in a small tree or shrub. Active nests were found in May and June and fledglings observed in June and July.<p>The Yucatan gnatcatcher has two songs, a low-pitched nasal one and a higher-pitched clearer one. Both are in this recording: [1].
照片
分布
鸟叫声
其他鸟类
Barred Dove
Geopelia maugeus
A small, long-tailed dove with extensive barring over its body. Pale gray head with distinctive orange eye-ring. Upperparts extensively barred brown; paler underside also strongly barred except for unbarred belly. Singles, pairs, and groups occur from sea level to the foothills. Forages on the ground or perches low in open habitats, lightly wooded areas, gardens, scrub, and plantations, often around villages. Unmistakable: the only small, long-tailed, extensively barred dove in range. Conspicuous high-pitched song is a disyllabic “wa-dloo” repeated often. Also gives a purring “grrrrrr” note.
Ochre-breasted Foliage-gleaner
Anabacerthia lichtensteini
Medium-sized foliage-gleaner with a short bill and attractive head pattern giving it a “cute” look. The crown and mask are gray-brown contrasting with a buffy-yellow eyebrow and throat. Buffy and unstreaked below and rufous-brown above. Found in the upper levels of forests and second growth. The song is a short fast trill.
Thick-billed Spiderhunter
Arachnothera crassirostris
Dull and largely unmarked spiderhunter. Brownish olive above with a yellow belly, faint yellow crescents around the eye, and faint speckling on the crown. Gives insistently harsh, nasal chattering calls that seem disproportionate for its small size. Forages in the middle levels of foothill and lowland rainforests, gleaning insects and sipping nectar from flowers.
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