Pacific Swallow
Hirundo javanica
This species is a small swallow at 13 cm (5.1 in) in length. It has a blue-black back and crown with browner wings and tail, a red face and throat, and dusky underparts. It differs from the barn swallow and the closely related welcome swallow in its shorter and less forked tail.
ID text from Wikipedia, CC BY-SA 4.0
Welcome Swallow
Hirundo neoxena
The welcome swallow is a small fast-flying bird. Its flying style is circular in pattern with swift darting motions. It has graceful shape and flight, moreover it often flies singly, in couples or in clusters. The welcome swallow is metallic blue-black above, light grey below on the breast and belly, and rusty on the forehead, throat and upper breast. It has a long forked tail, with a row of white spots on the individual feathers. These birds are about 15 cm (5.9 in) long, including the outer tail feathers which are slightly shorter in the female. The welcome swallow's weight is about 9-20g.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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