Lava Gull
Leucophaeus fuliginosus
Distinctive gull endemic to Galápagos. Adult is easy to identify by sooty-gray body, black head, white crescents above and below eye, and pale rump. Juvenile is grayish brown with tan scaling on the back and wings, and a pale rump. Found along the coast, almost never venturing inland or very far out to sea. Forages along beaches and rocky shorelines, and often perches on boats and docks. It has the smallest population of any gull in the world, estimated at less than 1000 birds.
识别特征
The lava gull is a distinctive gull, 51 to 55 cm (20–22 in) and weighs 380 g (13 oz). The adult plumage consists of a sooty brown to black head, which unlike other dark hooded gulls doesn't vary by season. The wings are dark gray with a contrasting white line on the leading edge, thought to play a function in displays and camouflage. Its dark gray body contrasts with a paler gray belly. The uppertail is white and grey lower down. The bill and legs are black, and the inside of the mouth is scarlet. It has white upper and lower eyebrows, with red lids. Immature gulls are generally dark brown.
分类信息
First described by John Gould in 1841 from a specimen collected on Santiago Island in the Galápagos. The species is sometimes placed in the genus Larus. It is possibly closely related to the laughing gull.
- 学名
- Leucophaeus fuliginosus
- 命名信息
- (Gould, 1841)
- 目
- Charadriiformes
- 科
- Laridae
- 属
- Leucophaeus
分布与栖息地
The entire population lives on the Galapagos Islands where it is found predominantly on the islands of Santa Cruz, Isabela, San Cristobal and Genovesa. Previously its population was estimated at 300–400 pairs; this estimate was revised downwards to 300-600 individuals in 2015. It is currently considered the rarest gull in the world.
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Brown Snake-Eagle
Circaetus cinereus
A medium-sized, brown eagle with yellow eyes, a large angular head, pale legs, and a brown-and-white-banded tail. In flight, the brown-and-silver underwing pattern is distinctive. It is sedentary and nomadic in savanna, plains, and semi-desert, where it mostly hunts snakes from perches, but it also eats other vertebrates. Immatures could be confused with immature Black-breasted Snake-Eagles, but the latter are rufous--not brown--and have a different underwing pattern.
Rufous Spinetail
Synallaxis unirufa
Plain rufous bird with dark lores and long spiky tail. Sexes alike. Uncommon in the upper subtropics and temperate zone, mostly from 2,000–3,200 m. Could be confused with Rufous Wren but smaller and shier with spiky tail and plain unbarred wings. Pairs or small family groups are found low to the ground, often around patches of bamboo, where they can be tricky to see well. Listen for the single “pweep!” call.
South Georgia Diving-Petrel
Pelecanoides georgicus
A very small, chunky petrel. Note the short broad wings and the pale white throat and underside. Look for whitish rump patches and gray feathering behind the eyes. Breeds on islands in the circumpolar subantarctic zone. Most populations nest on rocky slopes or flat land, but the population on Codfish Island, New Zealand, nests in burrows within unstable sand dunes no more than 100 meters from the sea; this population is sometimes split as a different species. Difficult to distinguish from Common Diving-Petrel at sea due to subtlety of plumage differences.
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。