... Very large flocks of swifts ('Cypselus apus') were observed flying over the plains north of Kuruman... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...Wood-Swallowsand Swifts do not belong to the Swallow family...
John Albert Leach 「An Australian Bird Book」
...Old-fashioned swifts still nest in hollow trees or caves, but chimneysare so much more abundant and convenient, that up-to-date birds preferthem...
Neltje Blanchan 「Birds Every Child Should Know」
...
When the baby swifts are old enough to climb out of the lattice, theystill cling near it for about a fortnight waiting for their wings togrow strong, before they try to leave the chimney...
Neltje Blanchan 「Birds Every Child Should Know」
...Not until swifts are a month old do the lazy littlefellows climb out of their deep, dark cavern into the boundless sky,which is their true home...
Neltje Blanchan 「Birds Every Child Should Know」
...Above the earth, the air is peopled by swifts and swallows in the daytime, and by goatsuckers at night...
W. H. Hudson 「Birds in Town and Village」
...The flight and general appearance of the swifts have already beendescribed...
Douglas Dewar 「Birds of the Indian Hills」
...This may be possible a few years hence, thanks to the aeroplane;but even then the swifts will have the advantage as regards cheapnessof transit...
Douglas Dewar 「Birds of the Indian Hills」
...These are saucer-shaped structures, composed of feathers, strawand other materials made to adhere together, and to the beam orstone to which the nest is attached, by the glutinous saliva ofthe swifts...
Douglas Dewar 「A Bird Calendar for Northern India」
...The nestingseason of the swifts and butcher-birds is nearly over...
Douglas Dewar 「A Bird Calendar for Northern India」
...Overhead, swifts and swallows dash joyously to and fro, feastingon the minute flying things that are found in the air even onthe coolest days...
Douglas Dewar 「A Bird Calendar for Northern India」
...Only one specimen secured, out of two or three of these swifts that wereflying about over the Ituri River, in company with several examples ofChætura cassini...
James Chapin 「Descriptions of Three New Birds from the Belgian Congo」
...Several White-throated Swifts were seen flying overhead at Pico de Jimulco on April 5...
Emil K. Urban 「Birds from Coahuila, Mexico」
...The swifts, last to come, are also first to go,spending less time in the land of their birththan either swallows or martins...
Frederick G. Aflalo 「Birds in the Calendar」
...Several times bothin spring and fall I have seen swifts gather inimmense numbers toward nightfall, to take refugein large unused chimney-stacks...
John Burroughs 「Bird Stories from Burroughs」
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