Blue Jay vs Common Kestrel
Cyanocitta cristata 比較対象 Falco tinnunculus
Side-by-Side Comparison
| 属性 | Blue Jay | Common Kestrel |
|---|---|---|
| 学名 | Cyanocitta cristata | Falco tinnunculus |
| 目 | Passeriformes | Falconiformes |
| 科 | Corvidae | Falconidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | 28.0 cm (11.0 in) | 34.0 cm (13.4 in) |
| 翼開長 | 42.0 cm (16.5 in) | 74.0 cm (29.1 in) |
| 体重 | 87.0 g (3.07 oz) | 190.0 g (6.70 oz) |
| 食性 | Omnivorous — nuts (especially acorns), seeds, berries, insects, and occasionally eggs or nestlings of other … | Primarily voles and mice, also lizards, large insects, and small birds. Hunts by hovering at … |
| 一腹卵数 | 2-7 | 1-7 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Blue Jay
Deciduous and mixed forests, parks, and suburban areas. Highly adaptable to human-modified landscapes.
Common Kestrel
Open country including farmland, grasslands, moorland, and urban areas. Common along motorways and in cities across Europe.
Song & Call Comparison
Blue Jay
A harsh, ringing 'jaay-jaay-jaay'. Also mimics Red-tailed Hawk and other species convincingly. Gives soft, liquid 'bell' calls and gurgling whispers in flocks.
Common Kestrel
A shrill, repeated 'kee-kee-kee-kee' or 'kik-ik-ik', especially near nest. Alarm call is a nasal chattering. Generally less vocal than larger falcons. Calls ring clearly in open country.
Geographic Range & Migration
Blue Jay
Eastern and central North America from southern Canada to the Gulf Coast. Some populations migrate irregularly.
Common Kestrel
Europe, Asia, and Africa. One of the most common and widespread raptors in the Old World.
保全状況
Blue Jay
Common Kestrel
How to Tell Them Apart
Blue Jay
Bright blue upperparts with black barring on the wings and tail. White face and underparts with a black necklace. Prominent blue crest.
Stout, straight black bill
Common Kestrel
Males have a blue-grey head and tail with a rufous back spotted with black. Females are rufous-brown with heavy barring. Both have a dark moustachial stripe.
Short, hooked grey bill with a yellow cere
About These Birds
Blue Jay
アオカケスは鮮やかな羽毛と大きな鳴き声で知られるカラス科の大胆で知能が高い鳥。アオカケスは毎秋数千個のドングリを蓄えることでカシの木の重要な散布者となっている。複雑な社会的行動には、給餌器から他の鳥を追い払うためにタカの声を真似ることも含まれる。
Common Kestrel
チョウゲンボウ（Falco tinnunculus）— ヨーロッパからアジア、アフリカに広く分布する小型のハヤブサ。ホバリングしながら地上の獲物を探す行動が特徴。