the wet season of late spring to early autumn. C. c. viridipennis apparently nests in the austral summer. Very few nests are known; they are half a cup attached to a vertical surface, often human-made such as a chimney. There is speculation that it also nests in hollow trees. The clutch size is two or three eggs and the incubation period is 17 to 18 days. Vocalization The principal call of Chapman's swift is "a long series of strident single notes...'tseep..tseep..tseep..tseep.tseep.tseep..tseep..tseep...tseep...tseep...', with seldom any twittering trills." It also makes "repeated shorter 'tsip' calls." Status The IUCN has assessed Chapman's swift as being of Least Concern. It has a very large range and an estimated population of at least 50,000 mature individuals, though the latter is believed to be decreasing. No immediate threats have been identified. It is "[o]ne of [the] rarer South American swifts with few specimens or observations...precise limits of [its] breeding range [are] not well known." References Chapman's swift Birds of the Amazon Basin Birds of Colombia Birds of the Guianas Birds of Trinidad and Tobago Chapman's swift Birds of Brazil Taxonomy articles created by Polbot