Wedge-Tailed Shearwater

ardenna pacifica

The wedge-tailed shearwater is a remarkable pelagic seabird that spends the vast majority of its life soaring over the vast expanses of the tropical Indian and Pacific Oceans. Known affectionately in Hawaii as the 'ua'u kani, which translates to 'moaning petrel,' these birds are famous for the eerie, ghost-like wailing choruses they produce within their nesting colonies at night. They are superb ocean gliders, perfectly adapted to dynamic soaring, which allows them to travel thousands of miles with minimal wing flapping. Despite their absolute mastery of the winds and waves, they must return to land to breed. They assemble in large, noisy colonies on offshore islands, where they dig deep underground burrows to raise a single chick. These birds serve as vital ecological links, transferring marine-derived nutrients back to terrestrial island ecosystems through their nesting activities.

生息地: Found across open tropical and subtropical oceans, nesting primarily on offshore sandy or rocky islands with low vegetation or loose soil suitable for digging burrows.

外見

Wedge-tailed shearwaters are medium-sized seabirds easily distinguished by their long, wedge-shaped tails and slender wings. They exhibit two distinct color phases: a dark morph, which is entirely dark grey-brown, and a pale morph, which features grey-brown upperparts contrasted with clean white underparts. They possess a slender, dark grey bill with a hooked tip and characteristic tube-nosed nostrils, while their legs and webbed feet are a pale flesh-pink color. In flight, they hold their wings slightly bowed and forward-pointing, effortlessly skimming the crests of ocean waves.

界Animalia門Chordata綱Aves目Procellariiformes科Procellariidae属Ardenna

Wedge-Tailed Shearwater

カテゴリ

鳥類

レア度

Common

危険度

1/5 · 非常に低い

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おもしろい事実

Their Hawaiian name 'ʻuaʻu kani' means 'moaning petrel' due to the eerie wails and groans they make in their colonies at night, which sound remarkably like crying babies or ghosts.

They are incredibly faithful to their nesting sites, often returning to the exact same burrow with the same mate year after year.

To survive long oceanic journeys, they produce a highly concentrated, energy-rich stomach oil from digested prey that can be stored for long periods or fed to their chicks.

特殊能力

Utilizes wind shear close to the ocean surface to fly vast distances while expending almost no energy.

Possesses specialized salt glands above the nasal passages to excrete excess salt swallowed while drinking seawater.

Uses its sharp claws and webbed feet to dig tunnels up to several feet deep in sandy or volcanic soils for safe nesting.

サイズと詳細

長さ: 41+ cm
翼開長: 97+ cm
体重: 0.3+ kg
寿命: 10+ 年
Top Speed: 60 km/h
一度の産卵数: 1+
抱卵期間: 48+ 日
渡りの距離: 10000 km

食性と食事

Feeds primarily on small fish, squid, and crustaceans captured at or just below the ocean's surface.

年齢による違い: Chicks are fed regurgitated stomach oil rich in lipids, while adults consume whole marine organisms.

主な食物

Flying Fish
Squid
Goatfish
Larval Crustaceans

採餌方法

Pursuit

生態系とのつながり

mutualism

Skipjack Tuna

Katsuwonus pelamis

Tuna drive schools of small fish to the ocean surface, making them accessible to the foraging shearwaters.

eaten by

Polynesian Rat

Rattus exulans

An invasive predator that raids nesting burrows on islands to consume shearwater eggs and defenseless chicks.

competitor

Great Frigatebird

Fregata minor

Harasses shearwaters in flight to force them to regurgitate their catch, a behavior known as kleptoparasitism.

特徴

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別名

まだ別名はありません。

コレクション

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安全性

危険度

1/5 · 非常に低い

まだ特別な安全上の注意はありません。

よくある質問

Wedge-Tailed Shearwaterを見分けるには？

Wedge-Tailed Shearwaterを識別する最も簡単な方法は、Snappit自然識別アプリを使用することです。

Wedge-Tailed Shearwaterの長さは何ですか？

41+ cm

Wedge-Tailed Shearwaterの翼開長は何ですか？

97+ cm

Wedge-Tailed Shearwaterの体重は何ですか？

0.3+ kg

Wedge-Tailed Shearwaterの寿命は何ですか？

10+ 年

Wedge-Tailed Shearwaterのtop Speedは何ですか？

60 km/h

Wedge-Tailed Shearwaterは何を食べますか？

Feeds primarily on small fish, squid, and crustaceans captured at or just below the ocean's surface.

Wedge-Tailed Shearwaterは通常どこに生息していますか？

Found across open tropical and subtropical oceans, nesting primarily on offshore sandy or rocky islands with low vegetation or loose soil suitable for digging burrows.