... 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」
...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」
...With mouths agape from ear to ear, the swifts draw in an insect dinnerpiecemeal, as they course through the air, just as the whip-poor-will,nighthawk and swallows do...
Neltje Blanchan 「Birds Every Child Should Know」
...,Parrots, Cuckoos, Trogons, Kingfishers, Woodpeckers, Goatsuckers, Swifts,Hummingbirds, Cotingas, Flycatchers, Larks, Crows and Jays, Blackbirds andOrioles...
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」
...At thisseason swifts are very noisy...
Douglas Dewar 「A Bird Calendar for Northern India」
...The swifts are not the only birds engaged in rearing up young inour verandahs...
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」
...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」
...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」
...The Swifts, though of especial interest, are not verynumerously represented in the collection...
A. F. R. Wollaston 「Pygmies and Papuans」
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