Predominantly blackish brown with a slightly paler rump, and distinctive wing shape, this swift is generally the sole representative of its genus in its insular range. The Lesser Antillean Swift is a poorly studied bird that is, as its name suggests, confined to the Lesser Antilles. It is generally fairly common, and at present the species is known to breed on the islands of Guadeloupe, Dominica, Martinique, St. Lucia, and St. Vincent, although like many other swifts breeding data are very sparse. This swift is generally encountered over forested habitats, in both lowlands and hilly regions, typically in groups of up to 40, and often in association with hirundines. Although usually considered to be resident, vagrants have been reported on other islands, among them Nevis.