Pygmy Swiftlet (Collocalia troglodytes, a Philippine endemic)
Habitat - Fairly common, smallest swiftlet in groups flying low over forest, clearings and logging roads (total length = 3.5 inches)
Shooting info - Bued River, Rosario, La Union, Philippines, February 14, 2017, EOS 7D MII + EF 400 f/4 DO II,
400 mm, f/5.0, ISO 320, 1/2000 sec, manual exposure in available light, hand held, major crop.