One factor considered was that Glossy Swiftlets have been shown to be more maneuverable than
Edible-nest Swiftlets (Tarburton 1986), as it has both a higher wing and tail maneuverability index. This could help explain why Glossy Swiftlets were able to produce greater variability in feeding and flutter maneuvers. Roll alone by Glossy Swiftlets had diurnal variations; however, no
diurnal variation was observed in foraging maneuvers by Edible-nest Swiftlets. Spatial variations
were shown by twist and tail-wing-open in both species, and flutter alone by Glossy Swift-lets. Monthly variations in foraging maneuvers indicate significant seasonal variations in insect diversity and change in prey preference with breeding stages (Johnson 1969). Diurnal variation in insect diversity in the forest is uncertain, although differing slightly in open lands. This indicates that most foraging attempts in the microhabitats .10 m Above Forest Canopy and .30 m Above Ground may be because of more dispersion of insects at that height (Johnson 1969).