Bare-legged Swiftlet vs African Swift

Aerodramus nuditarsus 比較対象 Apus barbatus

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Side-by-Side Comparison

属性 Bare-legged Swiftlet African Swift
学名 Aerodramus nuditarsus Apus barbatus
Caprimulgiformes Caprimulgiformes
Apodidae Apodidae
保全状況 Least Concern Least Concern
体長
翼開長 25.0 cm (9.8 in) 34.2 cm (13.5 in)
体重 13.3 g (0.47 oz) 42.666666666666664 g (1.51 oz)
食性 Obligate aerial insectivore; catches minute flies, beetles, and aerial spiders while foraging near cave roosts. Completely aerial diet of small flying insects and spiders; never forages on the ground or …
一腹卵数 -- 1-2
Population Trend
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Habitat Comparison

共通生息地

None

Bare-legged Swiftlet only

African Swift only

None

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Song & Call Comparison

Bare-legged Swiftlet

さえずり

High thin twittering; 'tsit-tsit' over New Guinea lowlands; echolocation clicks in cave roosts; calls weakly in flight; colonial nester producing soft flock chattering

African Swift

さえずり

Sharp, piercing screech followed by rapid chatter; intense series of notes escalating in speed and volume before fading.

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Geographic Range & Migration

Bare-legged Swiftlet

Found in lowland New Guinea and adjacent islands. Resident in lowland rainforest and forest edge. Little-known Papuan endemic.

African Swift

Found across sub-Saharan Africa from Senegal east to Ethiopia and south to South Africa. One of Africa's most common swift species.

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保全状況

Least Concern

Bare-legged Swiftlet

Least Concern

African Swift

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How to Tell Them Apart

Bare-legged Swiftlet

羽毛

Small; dark grey-brown upperparts; pale rump band; underparts whitish-grey; forked tail; bare unfeathered tarsi distinctive among swiftlets; New Guinea lowland cave-nesting species; bare legs visible at nest but rarely field-observable.

African Swift

羽毛

Dark sooty-brown throughout; pale throat patch whitish-grey; underparts slightly paler; broadly similar to Common Swift but slightly larger and marginally paler below; widespread Sub-Saharan African species.

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About These Birds

Bare-legged Swiftlet

ロングビルドスウィフトレットはニューギニア東部に生息し、裸足根が特徴的なアナツバメである。

African Swift

アフリカクロアマツバメはサハラ以南のアフリカに広く分布し、岩壁や建物の隙間に巣を作る。

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