Northern Gannet vs Brown Booby
Morus bassanus 比較対象 Sula leucogaster
Side-by-Side Comparison
| 属性 | Northern Gannet | Brown Booby |
|---|---|---|
| 学名 | Morus bassanus | Sula leucogaster |
| 目 | Suliformes | Suliformes |
| 科 | Sulidae | Sulidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | 93.0 cm (36.6 in) | — |
| 翼開長 | 180.0 cm (70.9 in) | 77.7 cm (30.6 in) |
| 体重 | 3000.0 g (105.82 oz) | 1378.6750000000002 g (48.63 oz) |
| 食性 | Shoaling fish, especially mackerel, herring, and capelin. Plunge-dives from heights of 30 meters at speeds … | -- |
| 一腹卵数 | 1 | 1-3 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Northern Gannet
Open ocean and coastal waters. Breeds in dense colonies on steep rocky islands and sea stacks.
Song & Call Comparison
Northern Gannet
Loud, harsh 'urrah-urrah' grunting and croaking at breeding colonies on sea stacks. Also gives a softer 'karrr' in flight. Large colonies are extremely noisy during the breeding season.
Brown Booby
Geographic Range & Migration
Northern Gannet
North Atlantic, breeding from Newfoundland and Gulf of St. Lawrence to Norway, Iceland, and Britain. Winters at sea south to the tropics.
Brown Booby
保全状況
Northern Gannet
Brown Booby
How to Tell Them Apart
Northern Gannet
Brilliant white body with black wingtips and a golden-yellow wash on the head and nape. Blue-grey bill with dark lines and pale blue eye-ring.
Long, straight, pointed, pale blue-grey bill with serrated edges
Brown Booby
About These Birds
Northern Gannet
The northern gannet is a spectacular plunge-diver, folding its two-meter wingspan into an arrow shape to hit the water at up to 100 km/h. Air sacs under the skin and a reinforced skull protect it from the impact. Bass Rock in Scotland hosts over 150,000 gannets, the largest single colony of any seabird in the world.
Brown Booby
64–74 cm. Dark brown above; white belly and undertail; yellowish bill. The most widespread booby; breeds pantropically on islands worldwide. Feeds on fish and squid near land by plunge-diving; often follows ships. Ground or bush nester; aggressive and bold near colonies.