Black-capped Swallow
Atticora pileata
The black-capped swallow is about 11.5 to 13.5 cm (4.5 to 5.3 in) long and weighs about 12 g (0.42 oz). The sexes have the same plumage. Adults have a glossy black head with brown-speckled white cheeks and throat. Their back is sepia brown, their rump a darker brown, and their uppertail coverts dark sooty brown. Their tail longish, forked, and dull sooty black. Their wing's lesser coverts are black to brownish black, their secondary and inner greater coverts are dark grayish brown, and their flight feathers brownish black. Voice: The black-capped swallow's calls "include a buzzy electric pzzzzzeeet! and a more liquid pweeet-pweeet".
ID text from Wikipedia, CC BY-SA 4.0
White-banded Swallow
Atticora fasciata
The white-banded swallow is a medium-sized swallow, measuring, on average, 15 cm (5.9 in) and weighing 12–16 g (0.42–0.56 oz). They usually have a wingspan of 92–108 mm (3.6–4.3 in). They decline in size from north to south, but this is a gradual decline, which suggests that there is no geographical variation. It is black, except for the band on its breast, its thighs, and bars on the edge of its wings, which are all white. It also has blackish-brown underwing coverts. Their feathers have a blue-black luster. This swallow has a deeply forked tail.
ID text from Wikipedia, CC BY-SA 4.0
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