Arctic Tern vs 鹭鹰
Sterna paradisaea 对比 Sagittarius serpentarius
Side-by-Side Comparison
| 属性 | Arctic Tern | 鹭鹰 |
|---|---|---|
| 学名 | Sterna paradisaea | Sagittarius serpentarius |
| 目 | Charadriiformes | Accipitriformes |
| 科 | Laridae | Sagittariidae |
| 保护状况 | Least Concern | Endangered |
| 体长 | 34.0 cm (13.4 in) | 130.0 cm (51.2 in) |
| 翼展 | 80.0 cm (31.5 in) | 210.0 cm (82.7 in) |
| 体重 | 110.0 g (3.88 oz) | 3700.0 g (130.51 oz) |
| 食性 | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | Snakes, lizards, small mammals, and large insects. Hunts on foot, stomping prey to death with … |
| 产卵数 | 2-3 | 1-4 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Arctic Tern
Breeds on coastal and tundra habitats. Spends most of its life at sea over the open ocean. Nests in colonies on beaches and rocky shores.
鹭鹰
Open grasslands, savannas, and light woodland across sub-Saharan Africa. Avoids dense forests and very arid regions.
Song & Call Comparison
Arctic Tern
A sharp, grating 'kree-yah' alarm call. Also gives 'kik-kik-kik' near the nest. Highly aggressive vocally during the Arctic breeding season. Calls are harsh and insistent.
鹭鹰
A surprisingly deep, resonant croaking 'kowrr-kowrr' often heard at dawn on African savannas. Also gives pig-like grunting sounds. Mostly silent compared to true songbirds.
Geographic Range & Migration
Arctic Tern
Breeds in the Arctic and sub-Arctic. Migrates to the Antarctic, experiencing two summers per year. Found on every ocean.
鹭鹰
Sub-Saharan Africa from Senegal and Somalia south to South Africa. Resident throughout its range.
保护状况
Arctic Tern
鹭鹰
How to Tell Them Apart
Arctic Tern
Pale grey upperparts, white underparts with a black cap. Blood-red bill and short red legs. Deeply forked tail streamers. Winter adults lose the full black cap.
Slender, pointed, bright red bill
鹭鹰
Grey body plumage with black flight feathers and thigh feathers. Distinctive long black crest feathers trail from the back of the head. Orange-red bare facial skin.
Short, strong, hooked greyish bill with a yellowish cere
About These Birds
Arctic Tern
北极燕鸥进行所有动物中最长的迁徙，每年从北极繁殖地飞往南极越冬地，往返距离超过70,000公里。体型纤细，翼展约80厘米，全身主要为白色，具黑色头冠和红色喙。无危；繁殖于北极和亚北极海岸及岛屿，全球种群约200万只。
鹭鹰
The secretary bird is the only raptor that hunts primarily on foot, striding through grasslands on crane-like legs up to 1.2 meters tall. Its name may derive from the crest feathers resembling quill pens tucked behind a secretary's ear. The species is classified as Endangered due to habitat loss and decline across much of its range.