White-backed Swallow
Cheramoeca leucosterna
An adult white-backed swallow averages 15 cm long, similar in size to other swallows found in Australia. The adult has a mottled grey cap above white eyebrows and a grey eye. It has a dark stripe running from the lores and across the nape of the neck. The back and most of the breast is white. The belly, wings and tail are black. The white-backed swallow has a deeply forked tail, with curved and pointed wings. The short bill is black; the legs and feet are grey. It has a slender, streamlined body. The eyes consist of a prominent, dark iris.
ID text from Wikipedia, CC BY-SA 4.0
White-thighed Swallow
Atticora tibialis
The white-thighed swallow averages about 12 cm (4.7 in) long and weighs 8.5 to 14 g (0.30 to 0.49 oz). The sexes have the same plumage. Adults of the nominate subspecies A. t. tibialis have a brownish black head with a slight green sheen, black lores, and gray-brown cheeks and throat. Their back is brownish black with a slight green sheen and their rump gray-brown. Their tail is slightly forked and brownish black. Their wings are mostly brownish black with slightly lighter tips on the greater coverts and tertials. Voice: The white-thighed swallow's calls include "a thin, high-pitched tsee-tit and a chit-it, chee-dee-dit?. While foraging they make a "constant, soft zeet-zeet call.
ID text from Wikipedia, CC BY-SA 4.0
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