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SETTLING IN AND THE FIGHT FOR HOMES
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adaptation adult swifts aerial Africa African palm swift air-borne insects alpine swift Apus Apus apus average bad weather behaviour birds black swift body broods of three cave swiftlets Chapter chick chimney swift clutch cold colony common swift Crataerina dark dusk entered entrance feeding feet flew flight flying further Gilbert White glide Gloger's rule grams ground habit hatched Hence hibernation house swift hummingbird incubation insects instance Koskimies later leave mate meal migration minutes moving nesting hole nestling swift night normally observations occurred Oxford pair pallid swift pectoralis minor muscles presumably probably race rain raised records roosting saliva scissor-tailed swifts screaming seen similar sometimes song-birds spine-tails starling stay suggests summer survive swallows Switzerland tail threat display throat torpid tower trees upstroke usually watching weather movement Weitnauer white-rumped swift white-throated swift wind wing winter World palm swift yearlings young swift