Mossy-nest Swiftlet (Aerodramus salangana) - Wind Cave Sarawak

Mossy-nest Swiftlet (Aerodramus salangana) - Wind Cave Sarawak
These swiftlets make their nest in these caves full of bats. There were more bats than swiftlets, yet they are nesting there. This swiftlet in the frame is close to the cave path.