Nelson'S Sparrow
探検鳥類
Nelson'S Sparrow
ammospiza nelsoni
Nelson's Sparrow is a small, secretive songbird primarily associated with dense, wet grasses and marshes. Named after American naturalist Edward W. Nelson, this bird is notorious for its skulking behavior, often preferring to run mouse-like through thick marsh vegetation rather than take flight. It comprises three distinct breeding populations: one in the freshwater marshes of the North American interior prairies, one along the Hudson Bay, and one along the northern Atlantic coast. During migration and winter, they converge along the Atlantic and Gulf coasts of the United States. They are a rewarding challenge for birders who have the patience to spot them, offering a beautiful splash of warm ochre and crisp gray plumage once they finally emerge from the reeds.
生息地: Typically found in the dense, wet grasses of freshwater marshes, coastal estuaries, wet meadows, and saltmarshes.
外見
Nelson's Sparrow is a compact sparrow measuring 11 to 13 centimeters in length. Its most striking feature is a bright ochre or orange-buff face, which contrasts strongly with a broad gray nape and dark brown crown stripes. The bird's back is richly patterned with dark brown and prominent white stripes, while the breast is a warm buff with relatively faint, blurry streaking that fades into a white belly. It features a relatively large bill and a short, spiky tail that aids in navigating through dense marsh grass.
界Animalia門Chordata綱Aves目Passeriformes科Passerellidae属Ammospiza
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
Because they are so reluctant to fly when flushed by humans or predators, they will often run through the mud beneath dense marsh grass exactly like a small rodent.
Nelson's Sparrow and the Saltmarsh Sparrow were once considered a single species known as the 'Sharp-tailed Sparrow' before being split into two distinct species in 1995.
Their unusual song is often described as sounding like a drop of cold water hitting a hot frying pan—a quiet, wheezy hiss.
There are three distinct breeding populations of Nelson’s Sparrow, and the birds of the interior prairies look surprisingly different in color saturation than those breeding on the Atlantic coast.
特殊能力
能力
Mouse-like Foraging
Navigates dense marsh vegetation by running quickly along the ground rather than flying, which helps it evade aerial predators.
能力
Scramble Mating System
Males do not defend strict territories; instead, they roam widely across the marsh to find receptive females in a non-territorial mating strategy.
能力
Saline Tolerance
Coastal and wintering populations have physiological adaptations to process high-salt diets, allowing them to thrive in tidal saltmarshes.
サイズと詳細
- 長さ
- 11-13 cm
- 翼開長
- 17-20 cm
- 体重
- 0.013-0.017 kg
- 寿命
- 3-7 年
- Top Speed
- 40 km/h
- 一度の産卵数
- 3-5
- 抱卵期間
- 11-12 日
- 渡りの距離
- 3500 km
食性と食事
Consumes a mix of insects and marine invertebrates during the breeding season, switching primarily to grass and weed seeds in the winter.
年齢による違い: Nestlings are fed an exclusively protein-rich diet consisting of insects and small invertebrates.
主な食物
- Insects
- Spiders
- Amphipods
- Marsh grass seeds
- Marine worms
採餌方法
- Foraging
生態系とのつながり
host plant
Smooth Cordgrass
Spartina alterniflora
Builds nests in and forages among smooth cordgrass.
eaten by
Northern Harrier
Circus hudsonius
Preyed upon by aerial predators hunting over open marshes.
competitor
Marsh Wren
Cistothorus palustris
Competes for resources and faces occasional nest destruction by aggressive territorial marsh wrens.
特徴
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別名
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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
Nelson'S Sparrowを見分けるには？
Nelson'S Sparrow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。
Nelson'S Sparrowの長さは何ですか？
11-13 cm
Nelson'S Sparrowの翼開長は何ですか？
17-20 cm
Nelson'S Sparrowの体重は何ですか？
0.013-0.017 kg
Nelson'S Sparrowの寿命は何ですか？
3-7 年
Nelson'S Sparrowのtop Speedは何ですか？
40 km/h
Nelson'S Sparrowは何を食べますか？
Consumes a mix of insects and marine invertebrates during the breeding season, switching primarily to grass and weed seeds in the winter.
Nelson'S Sparrowは通常どこに生息していますか？
Typically found in the dense, wet grasses of freshwater marshes, coastal estuaries, wet meadows, and saltmarshes.
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