The Mariana swiftlet (Aerodramus bartschi) is a small bird in the family Apodidae. It is endemic to the Mariana Islands, a group of islands in the western Pacific Ocean. The Mariana swiftlet is a small, dark bird with a wingspan of about 20 cm (8 in). It has a long, forked tail and short legs. The Mariana swiftlet is an aerial insectivore, feeding on insects that it catches in flight. It builds nests out of saliva in caves and other dark places.
The Mariana swiftlet is an important part of the ecosystem of the Mariana Islands. It helps to control populations of insects, and its nests are used by other animals for shelter. The Mariana swiftlet is also a popular tourist attraction, as visitors can watch the birds fly in and out of their nests. The Mariana swiftlet is a unique and fascinating bird that is an important part of the Mariana Islands.