Edible-nest Swiftlets were more active in early morning and late afternoon and were in larger
foraging flocks near caves used for breeding. Frequency of feeding attempts by both species
was correlated with foraging flock size. Edible-nest Swiftlets forage high above the canopy, while Glossy Swiftlets forage at the canopy level and near the ground. Johnson (1969)
suggested that insects move upwards in air with an increase in ambient temperature. This may be
the reason for the shift of Edible-nest Swiftlets to higher altitudes during foraging and Glossy
Swiftlets, being smaller and more agile to maneuver in confined spaces, to move towards
relatively cooler zones inside the canopy at the forest edges or stream banks close to open paddy
lands for foraging.