Great Dusky Swift vs White-naped Swift

Cypseloides senex 对比 Streptoprocne semicollaris

Side-by-Side Comparison

属性	Great Dusky Swift	White-naped Swift
学名	Cypseloides senex	Streptoprocne semicollaris
目	Caprimulgiformes	Caprimulgiformes
科	Apodidae	Apodidae
保护状况	Least Concern	Least Concern
体长	—	—
翼展	33.8 cm (13.3 in)	44.4 cm (17.5 in)
体重	83.0 g (2.93 oz)	175.0 g (6.17 oz)
食性	Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial …	Exclusively aerial insectivore catching small flying insects and spiders drifting in aerial plankton at altitude.
产卵数	1-2	2
Population Trend	—	—

Habitat Comparison

共同栖息地

🌲 Forest

Great Dusky Swift only

无

White-naped Swift only

无

Song & Call Comparison

Great Dusky Swift

鸣唱

Loud, churring trill; harsher and louder than other Cypseloides; calls over Iguacu Falls and major Neotropical waterfalls; buzzy 'bzzzt-bzzzt' in aerial groups

White-naped Swift

鸣唱

Very loud screaming trill; deep, powerful 'shreee' from Mexico's largest swift; calls over cliffs and canyons; impressive volume; deeper than White-collared Swift

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-naped Swift

Endemic to Mexico from Nayarit south to Oaxaca. Found in montane forest and canyons at 1,000–3,000 m. Nests behind waterfalls.

保护状况

Least Concern

Great Dusky Swift

Least Concern

White-naped Swift

How to Tell Them Apart

Great Dusky Swift

羽毛

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-naped Swift

羽毛

Very large; entirely black with white patch restricted to nape only, not forming a full collar; large square tail; Mexican endemic and the largest swift in Middle America; white nape …