Great Dusky Swift vs White-fronted Swift
Cypseloides senex 비교 대상 Cypseloides storeri
Side-by-Side Comparison
| 속성 | Great Dusky Swift | White-fronted Swift |
|---|---|---|
| 학명 | Cypseloides senex | Cypseloides storeri |
| 목 | Caprimulgiformes | Caprimulgiformes |
| 과 | Apodidae | Apodidae |
| 보전 상태 | Least Concern | Data Deficient |
| 체장 | — | — |
| 날개 폭 | 33.8 cm (13.3 in) | 27.4 cm (10.8 in) |
| 체중 | 83.0 g (2.93 oz) | 39.25 g (1.38 oz) |
| 식성 | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … | Obligate aerial insectivore; takes small flies, beetles, and aerial spiders in swooping fast-flight passes. |
| 산란 수 | 1-2 | -- |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Great Dusky Swift
Loud, churring trill; harsher and louder than other Cypseloides; calls over Iguacu Falls and major Neotropical waterfalls; buzzy 'bzzzt-bzzzt' in aerial groups
White-fronted Swift
Poorly known vocalizations; thin twittering presumed; calls over Mexican montane waterfalls; high-pitched soft chip notes; very rarely documented; data-deficient species
Geographic Range & Migration
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
White-fronted Swift
Endemic to western Mexico from Jalisco to Oaxaca. Resident in forested highlands near canyon streams at 1,000–2,500 m. Poorly known.
보전 상태
Great Dusky Swift
White-fronted Swift
How to Tell Them Apart
Great Dusky Swift
Very large; entirely dark sooty-brown with pale grey forehead and chin scaling; slightly paler underparts; broad wings; largest Cypseloides swift; South American waterfall specialist with dusky uniform plumage and imposing …
White-fronted Swift
Blackish-brown throughout with a prominent white frontal patch on forehead and lores; no other pale markings; slightly paler brownish below; poorly known Mexican endemic known from very few specimens.
About These Birds
Great Dusky Swift
18–20 cm의 대형 칼새로 브라질 동남부·파라과이 동부·아르헨티나 북동부에 서식. 어두운 그을린 갈색 깃털. 삼림 협곡과 폭포 위를 날며 먹이를 구하는 공중 곤충식성. 폭포 뒤에 대규모 집단으로 둥지를 튼다. Cypseloides 속의 가장 큰 종.
White-fronted Swift
14 cm의 중형 칼새로 멕시코 서부 1,500–3,000m 고도 산지림 고유종. 흰 이마 반점이 있는 그을린 흑색 깃털. 삼림 산지사면 위를 날며 먹이를 구하는 공중 곤충식성. 가장 알려지지 않은 신열대 칼새 중 하나. 취약종으로 분류.