Mariana Swiftlet

The Mariana swiftlet or Guam swiftlet (Aerodramus bartschi) is a species of swiftlet in the family Apodidae. The swiftlet is about 11 cm in length with a dark grey-brown head and upperparts. Its throat and upper breast are grey-white with the rest of the underparts darker grey. The tail has a shallow fork and the plumage lacks gloss.