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Crested-swifts
Order: Apodiformes
Family: Hemiprocnidae
4 species
Southeast Asia;
16-33 cm; crest and flank patch of silky feathers; bill small, flat, triangular; gape broad; eyes large; neck short; wings long, pointed; tail long, forked, outer feathers slender; legs short; feet weak; toes long;
aerial insectivores that perch more than swifts;
single-egg clutch; nest glued to side of branch; males more brightly colored.