Grey-rumped Swift

The grey-rumped swift or gray-rumped swift (Chaetura cinereiventris) is a species of bird in subfamily Apodinae of the swift family Apodidae. It is found in Honduras, Nicaragua, Costa Rica, and Panama; in every mainland South American country except Chile, French Guiana, Suriname, and Uruguay; in Trinidad and Tobago; and on Grenada. == Taxonomy and systematics == The grey-rumped swift has these seven subspecies: C. c. phaeopygos Hellmayr, 1906 C. c. lawrencei Ridgway, 1893 C. c. schistacea Todd, 1937 C. c. guianensis Hartert, E.J.O., 1892 C. c. occidentalis Berlepsch & Taczanowski, 1884 C. c. sclateri Pelzeln, 1868 C. c. cinereiventris Sclater, P.L., 1862 The grey-rumped swift, pale-rumped swift (C. egregia), band-rumped swift (C. spinicaudus), and Lesser Antillean swift (C. martinica) were at one time placed in genus Acanthylis. Some authors have suggested that the grey-rumped and pale-rumped swifts are conspecific. Others have suggested that all of the grey-rumped subspecies except the nominate C. c. cinereiventris belong to another species under the binomial C. sclateri. == Description == The grey-rumped swift is about 10.5 cm (4.1 in) long and weighs about 17 g (0.60 oz). It has a protruding head, a short square tail, and wings that bulge in the middle and…