Cook's Petrel

Pterodroma cookii

A small, fast-flying petrel with long narrow wings and bright white underparts. Found singly or in loose aggregations, well offshore in warmer Pacific waters, mainly from March to August. Flight varies from low and weaving, into the wind, to high and arcing across the wind. Note gray cap and upperparts with dark M pattern across upperwings and dark tail tip. Underparts are white with very narrow black margins to wings. Many birds off Mexican coast are in wing molt.

分类信息

学名
Pterodroma cookii
命名信息
(Gray, GR, 1843)
Procellariiformes
Procellariidae
Pterodroma

分布与栖息地

Cook's petrel breeds only in New Zealand on three small islands: Little Barrier Island, Great Barrier Island, and Codfish Island. The breeding season is the southern summer, October–May. It nests in burrows and rock crevices, preferring sites on thickly forested ridges. Its call is a three-part kek, kek, kek. The species was formerly more numerous; the current population estimate is 1,258,000 and declining. It is classified as vulnerable because it breeds on only three small islands. While Little Barrier Island's population remains stable, the other two populations are decreasing. On Great Barrier Island, introduced pigs, dogs, rats and cats attack nests and burrows, as do native weka (a flightless rail), preying on eggs and nestlings and reducing the population from an estimated 20,000 to 100[citation needed]. Fossils show that prior to the arrival of humans to New Zealand, Cook's petrel used to breed on the mainland New Zealand North and South Islands.<p>Cook's petrel migrates to the Pacific Ocean from New Zealand when it is not breeding. It has sometimes been seen off the west coast of the United States and off the west coast of tropical South America.

繁殖区
PO : Great and Little Barrier is. (off ne North I.) and Codfish I. (=Whenua Hou, nw of Stewart I.; New Zealand)
非繁殖区
to Tasman Sea, off se Australia and ne to se Pacific Ocean off Aleutian Is. and w Pacific coast from nw Mexico to Chile
迁徙
Complete migrants

保护状况

种群趋势
rising

照片

分布

鸟叫声

其他鸟类

Piapiac

Piapiac

Ptilostomus afer

A unique, slender magpie-like bird with a long narrowing tail and a chunky bill. Adults are uniform glossy black; immatures have black-tipped pink bills. Resident in open savanna with palms, in cultivated areas, and in rural villages. Forages on the ground in groups, often near larger mammals including domestic stock, walking on the ground or riding on the back of the mammal. Also perches in treetops and palms when roosting or resting. Loaded with character. Groups sometimes become garrulous when calling to each other, mostly giving piping high-pitched starling-like “cheeet” calls.

Central American Pygmy-Owl

Central American Pygmy-Owl

Glaucidium griseiceps

Very small owl of humid evergreen forest in tropical lowlands that is active during the day. Favors forest canopy where it is rarely seen, but sometimes hunts low at forest edges. Most often detected by its tooting call, given at any time of day but mainly early and late. Like other pygmy-owls, presence often revealed by mobbing bands of small songbirds. Ferruginous Pygmy-Owl favors more open habitats, is seen much more frequently, and has pale streaks (not spots) on the crown and a slightly different tooting song.

Black-throated Canary

Black-throated Canary

Crithagra atrogularis

A small, nondescript, streaky gray-brown seedeater with a lemon-yellow rump, white tail tips, and a variable dark throat (more obvious in the male). Pairs and flocks frequent thorn scrub, broadleaf woodland, scrubby patches in upland grassland, cultivation, and gardens, where they forage on the ground and in small shrubs and grass. The song is a complex collection of whistles and warbles, and calls include a simpler melodic one- or two-note “soooe-sweee.” The similar Reichenow’s Seedeater and Yellow-rumped Serin differ from Black-throated Canary by lacking a dark patch on the chin and throat.

开始您的观鸟之旅

在户外识别鸟类,并在下一次观察时随手查阅鸟类图鉴。