Rufous-Crowned Sparrow

aimophila ruficeps

The Rufous-Crowned Sparrow (Aimophila ruficeps) is a charming and often elusive passerine native to the arid and semi-arid regions of western North America. Distinguished by its striking rufous cap, this small bird is a master of camouflage, blending seamlessly into its scrubby, rocky habitats. While not as brightly colored as some other sparrows, its subtle beauty and distinctive song make it a favorite among birdwatchers. These sparrows are typically ground-dwellers, flitting through dense undergrowth in search of seeds and insects, and are known for their strong, if sometimes shy, presence in their chosen territories. They exemplify resilience and adaptation, thriving in environments that might seem harsh to other species.

生息地: Found in dry, rocky hillsides, chaparral, coastal sage scrub, canyons, and open oak woodlands with dense undergrowth.

外見

The Rufous-Crowned Sparrow is a medium-sized sparrow, measuring about 12-16 cm (5-6 inches) in length with a wingspan of 18-24 cm (7-9.5 inches). Its most distinctive feature is the prominent rufous (reddish-brown) crown, often bordered by black and sometimes a grayish-white supercilium. The back is streaked brown, while the underparts are plain grayish-white to buff, lacking strong streaking. It has a relatively long tail and a conical bill. Juveniles are streaked on the breast and have a less defined rufous crown.

界Animalia門Chordata綱Aves目Passeriformes科Passerellidae属Aimophila

Rufous-Crowned Sparrow

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

Despite being ground-dwellers, they are agile fliers over short distances, especially when darting into cover.

Males are known to sing year-round, not just during the breeding season, though their song is most fervent in spring.

Their song is often described as a series of clear, sweet notes followed by a dry, buzzing trill, making it distinctive among sparrow calls.

They build cup-shaped nests on or very close to the ground, well-hidden within dense vegetation to protect against predators.

特殊能力

This sparrow is adept at navigating dense undergrowth and rocky terrain, primarily foraging on the ground for seeds and insects. Its drab coloration provides excellent camouflage against the soil and leaf litter.

Rufous-Crowned Sparrows possess a complex repertoire of songs and calls used for territory defense, attracting mates, and alarm signals. Their melodic, often buzzy, trills are a key identifier in their rugged habitats.

Thriving in arid environments, these birds are well-adapted to conditions with limited water. They likely obtain much of their necessary moisture from their insect diet and dew.

サイズと詳細

長さ: 12-16 cm
翼開長: 18-24 cm
体重: 0.015-0.025 kg
寿命: 3-6 年
Top Speed: 35 km/h
一度の産卵数: 2-5
抱卵期間: 11-14 日

食性と食事

Rufous-Crowned Sparrows primarily consume a mix of seeds and insects, adapting their diet based on seasonal availability. During breeding season, insect consumption increases to provide protein for young.