Aerodramus is a genus of birds commonly known as swiftlets, which are part of the family Apodidae. These small, agile birds are primarily found in tropical and subtropical regions of Asia, Africa, and the Pacific Islands. They are known for their unique nesting habits, often building nests in caves or on cliffs using saliva, which hardens to form a structure. Swiftlets are remarkable for their ability to echolocate, allowing them to navigate in dark environments. They have a diet mainly consisting of insects, which they catch while flying. Their distinctive calls and social behavior make them fascinating subjects for birdwatchers and researchers alike.