... 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」
...And, close by, the greyimmemorial church, with its churchyard, its grandold yew-tree, and, overhead, the bunch of swifts,rushing with jubilant screams round the square tower...
W. H. Hudson 「Birds and Man」
...In some Swifts the four toespoint forward; this helps also in cliff clinging...
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」
...Bill, in the Goatsuckers and Swifts, small; mouth large; in the Hummingbirds,bill long, slender, needle-like; wings and tail variable; feet,in all three groups, small and weak...
Frank M. Chapman 「Color Key to North American Birds」
...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」
...The recollection of this seaside gathering raises anew in my mind thequestion why, if swallows and swifts migrate exclusively in the daytime,we so rarely see anything of them on the passage...
Bradford Torrey 「The Foot-path Way」
...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」
...They arenot, however, exclusive in their fraternization; as they hunt insociety with their relatives the Swifts and Swallows, and evenaccompany them in distant flights...
Rev. C. A. Johns 「British Birds in their Haunts」
...And as for theirmore distant relatives, the Hummingbirds and Chimney Swifts, it wouldtake a story apiece as long as this to begin to tell of their strangedoings...
Edith M. Patch 「Bird Stories」
...Confine one ofthese swifts to a room and it does not perch, butafter flying till it becomes bewildered and exhausted,it clings to the side of the wall till itdies...
John Burroughs 「Bird Stories from Burroughs」
...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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Duchesne dryad venetian
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