Australian Swiftlet vs Uniform Swiftlet

Australian Swiftlet

Aerodramus terraereginae

Tiny12 gGrassland

It is 11–12 centimetres (4.3–4.7 in) long with a wing length of 107–118.2 millimetres (4.21–4.65 in) and a weight of 10.5–12.5 grams (0.37–0.44 oz). The upperparts are dark grey-brown while the underparts are a uniform greyish. There are pale feathers on the forehead and lores. The rump is normally pale greyish but can occasionally be darker. The tail is slightly forked. The form chillagoensis is smaller and paler with a weight of around 9.39 grams (0.33 oz). It has a high-pitched flight call. In its breeding caves, it utters a metallic clicking call, used for echolocation.

ID text from Wikipedia, CC BY-SA 4.0

Photo: Donald Davesne · CC BY 4.0

Uniform Swiftlet

Aerodramus vanikorensis

Tiny11 gForest

The uniform swiftlet is a gregarious, medium-sized swiftlet with a shallowly forked tail. It is about 13 cm long with a wingspan averaging around 27 cm. It weighs about 11 grams. The colouring is dark grey-brown, darker on the upperparts with paler underparts, especially on chin and throat. It is similar to, and most likely to be confused with, the white-rumped swiftlet or mountain swiftlet.

ID text from Wikipedia, CC BY-SA 4.0

Photo: Lip Kee Yap from Singapore, Republic of Singapore · CC BY 2.0

Photos and recordings are credited to their authors under the licence shown. Full profiles: Australian Swiftlet and Uniform Swiftlet.