...In some Swifts the four toespoint forward; this helps also in cliff clinging... 
John Albert Leach 「An Australian Bird Book」
...Though so commonin the upper air, Swifts have not, in Victoria, been recordedas having been seen to alight...
John Albert Leach 「An Australian Bird Book」
...
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」
...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」
...Color, in Goatsuckers, mixedbrown, buff and black; in Swifts, black and white; in Hummingbirds,usually shining green above with resplendent throat-patches of variedhues...
Frank M. Chapman 「Color Key to North American Birds」
...,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」
...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」
...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」
...At thisseason swifts are very noisy...
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」
...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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