Laysan Finch
Telespiza cantans
A finch-billed Hawaiian honeycreeper endemic to the island of Laysan; does not occur in the main Hawaiian Islands. An introduced population occurs on Pearl and Hermes Atoll. Unlikely to be confused with any other species; the only other passerine bird on Laysan is the Millerbird, which lacks the Laysan Finch’s heavy bill. Males have a bright yellow head. Females are paler yellow and streaked.
识别特征
The Laysan finch is a large honeycreeper with a heavy bill. Overall the male has yellow plumage with a whitish belly and a grey neck. The female is duller than the male, with brown streaking. It is almost impossible to confuse the Laysan finch with any other bird in the field as it is the only passerine species found on the few islands it lives on.
分类信息
- 学名
- Telespiza cantans
- 命名信息
- Wilson, SB, 1890
- 目
- Passeriformes
- 科
- Thraupidae
- 属
- Telespiza
分布与栖息地
- 迁徙
- Resident species
保护状况
The Laysan finch is listed as Vulnerable by the IUCN because of its highly restricted range and vulnerability to extremes of weather, and it is considered endangered by the State of Hawaiʻi and U.S. government. It survived the devastating effects of the introduction of domestic rabbits on Laysan Island (unlike the Laysan millerbird, honeycreeper and rail) by taking carrion and seabird eggs. However, this caused their population to shrink to fewer than 100 individuals and the bottleneck caused a reduction in genetic diversity that may have put the species at increased risk of extinction. The birds also suffered a loss of heterozygosity following founding events on other islands which may have caused an accumulation of deleterious recessive alleles in the populations.<p>Laysan is now part of the Hawaiian Islands National Wildlife Refuge. The population is considered stable with the biggest threat being uncontrollable climate change.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Broad-billed Sandpiper
Calidris falcinellus
Small, odd sandpiper with short legs and a long, thin bill, turned down at the tip. Upperparts dark, contrasting with the white underparts and streaky breast. Furtive, with a slow feeding action. When flushed, flight is low and often short. Bold head pattern, evident in all seasons, is the best feature to look for in winter-plumaged birds. Breeds in taiga bogs, usually at coasts and estuaries on migration and in winter.
Sangihe Golden-Bulbul
Hypsipetes platenae
A dull thrush-sized songbird with a long stout bill. Uniform dark olive above with a prominent yellow patch between bill and eye, a yellow throat, a dark eye, and paler cheeks. Rest of underparts greenish. Juveniles duller and pale-eyed. Rare; small groups are confined to remnant patches of foothill forest on Sangihe. Prominent yellow parts of plumage separate it from the smaller, browner Sangihe Whistler. Calls include “bwit” and thrush-like “puk” notes. Loud, two-part song starts with four rising nasal notes, followed by whistles: “kwee-kwee-kwee-kwee-DEEP-pDEEP-pDEEP”.
Guadalcanal Crow
Corvus woodfordi
A medium-sized crow with a rather short tail and a massive pale dark-tipped bill. Found in lowland and montane rainforest up to 1250 meters of elevation. Voice typically consists of staccato cawing and rasping.
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