Small, uniformly gray swift. With a very good view, pale rump and tiny spines on tail can be seen. Flies rigidly with wings pushed forwards. Seen in flight over and adjacent to all types of forest. On Madagascar, often nests and roosts in cavities of baobab trees. Similar in size and shape to Little Swift, but doesn’t show a bold white band on the rump, and has weaker flight. Similar in size to Malagasy Palm Swift, but has a much shorter square tail. Smaller and shorter-tailed than Madagascar Swift, with much weaker flight.