Dolphin Gull
Leucophaeus scoresbii
Handsome, distinctive dark gull of southern South America and Falklands. Favors rocky coastal areas, but also ranges to lakes near the coast. Fairly common; can be confiding at harbors and waterfronts. Feeds mainly by scavenging and often gathers at sea mammal and seabird colonies. Adult has diagnostic smoky gray body, thick red bill, and red legs. Immature and nonbreeding adult have a dark hood, but immatures also have paler pinkish legs and bill, and a black band on the tail.
分类信息
- 学名
- Leucophaeus scoresbii
- 命名信息
- (Traill, 1823)
- 目
- Charadriiformes
- 科
- Laridae
- 属
- Leucophaeus
分布与栖息地
The dolphin gull is found round the coasts of Chile, Argentina and the Falkland Islands. It is a vagrant to South Georgia and the South Sandwich Islands. It is found on rocky coasts and in the vicinity of other colonies of seabirds, slaughterhouses, sewage outflows and farmyards.
- 繁殖区
- SA : coastal c, s Chile and Argentina to Tierra del Fuego; Falkland Is.
- 非繁殖区
- some move n on coasts
- 迁徙
- Complete migrants
行为
The dolphin gull is a scavenger and opportunistic predator. It feeds on carrion, offal, bird eggs, nestlings, marine invertebrates and other natural food. When humans disturb nesting seabirds, it takes advantage of the absence of adult birds to raid their vacated nests. It was found that excluding humans from areas where cormorants were nesting increased the reproductive success of the cormorants. It also takes advantage of the activities of marine mammals to scavenge for dead fish, placentae and faeces, which are a major attraction.<p>Dolphin gulls nest in small colonies of up to 200 pairs and are usually on low cliffs, sand or shingle beaches, headlands or marshy depressions. Two to three eggs are laid in December and the chicks fledge in March. The older chicks gather together in crèches.[citation needed]
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Luzon Racquet-tail
Prioniturus montanus
A medium-sized parrot of montane forest on Luzon. The two central tail feathers have extended shafts ending in a racket shape. Overall green in color, darker on the back and paler below. Male has a blue face and a red crown. The similar Green Racquet-tail may overlap geographically, but Luzon is usually found at higher elevations and has a darker back. Voice includes various grating calls and shrill squeals.
Malachite Kingfisher
Corythornis cristatus
Small, gem-like wetland kingfisher. Shows geographical variation, with most birds having orange underparts, but birds in some parts of the range have a white belly. Found in almost all habitats with water, including streams, rivers, lakes, rice paddies, and lagoons. Sits motionless for long periods before plunging to the water to snatch prey. Call is a harsh “tshik,” often given in flight. Similar to African Pygmy-Kingfisher, but larger, has less orange on the face, and prefers aquatic habitats.
Rufous-vented Chachalaca
Ortalis ruficauda
A large, long-tailed, chickenlike, and ground-dwelling bird of scrub and woodlands. Brown overall with a buff-orange vent. Commonly runs from perceived threats but sometimes bursts into rapid short flight. Unique in Caribbean, but in northern South America Chestnut-winged Chachalaca is light underneath and lacks rufous in tail. Produces a variety of vocalizations, including a loud “wuck-a-wuck-wuck” that is given in a crescendo series, a quiet muttered “wuck-wuck-wuck…,” a loud and squeaky shrill call often heard as “yuck” that is produced singly or in a series, and a loud squeaky “zwick,” given singly or in rapid bursts.
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