American Crow vs Eastern Bluebird
Corvus brachyrhynchos 比較対象 Sialia sialis
Side-by-Side Comparison
| 属性 | American Crow | Eastern Bluebird |
|---|---|---|
| 学名 | Corvus brachyrhynchos | Sialia sialis |
| 目 | Passeriformes | Passeriformes |
| 科 | Corvidae | Turdidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | 45.0 cm (17.7 in) | 17.5 cm (6.9 in) |
| 翼開長 | 99.0 cm (39.0 in) | 27.0 cm (10.6 in) |
| 体重 | 450.0 g (15.87 oz) | 31.0 g (1.09 oz) |
| 食性 | Highly omnivorous — insects, earthworms, seeds, fruit, eggs, nestlings, carrion, and human food waste. Among … | Insects in summer, berries in winter. Hunts from low perches, dropping to the ground to … |
| 一腹卵数 | 3-7 | 4-5 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
American Crow
Extremely adaptable — found in farmland, open woodland, suburban neighborhoods, parking lots, and urban parks.
Eastern Bluebird
Open woodland, farmland edges, orchards, and parks with scattered trees and open ground. Readily uses nest boxes.
Song & Call Comparison
American Crow
Classic 'caw-caw-caw' repeated in series. Family groups use distinct dialects. Also gives rattling, knocking, and a short 'cah' flight call. Highly social and vocal.
Eastern Bluebird
A rich, melodious warbled 'chur-wi, tur-a-lee' song. Both sexes sing. Call is a soft, musical 'turee'. Song is gentle and flute-like, suggesting a small thrush. Given from exposed perch.
Geographic Range & Migration
American Crow
North America from southern Canada through the United States to northern Mexico.
Eastern Bluebird
Eastern North America from southern Canada to Honduras and Nicaragua. Partially migratory.
保全状況
American Crow
Eastern Bluebird
How to Tell Them Apart
American Crow
All black with a slight glossy sheen. Squared-off tail and smooth throat distinguish it from the common raven.
Straight, sturdy black bill smaller than a raven's
Eastern Bluebird
Males are vivid royal blue above with a rusty-red breast and white belly. Females are grey-blue with a paler rust breast.
Short, thin, dark bill
About These Birds
American Crow
北米全域に広く分布する大型のカラス（体長40〜53cm）。全身光沢のある黒で、知性が高く強い社会性を持つ。Corvus brachyrhynchos（アメリカガラス）は北米で最もよく見られるカラスで、交通量の多い道路に堅い木の実を置いて車に割らせる「道具使用」が観察されている。Corvidae科。
Eastern Bluebird
北米に生息するヒタキで、青い上面とオレンジ色の胸を持つ。巣箱の設置プログラムにより個体数が回復した。