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THE ORIGIN OF BIRDS AND FLIGHT
TEMPERATURE CONTROL AND WATER
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ability to fly adaptations aerofoil aeroplane air sac air stream airborne alula angle of attack animal anti-stalling device antibodies Archaeopteryx area and fovea avian barbules basilar membrane Bernoulli's theorem bird flight bird is able bird's wing blood body temperature calcium cells cleidoic egg cochlea contour feathers Cretaceous developed diving domestic fowl drag effect eggshell embryo excretion Figure flying bird fossil fovea friction area gliding heat loss homoiothermic increase insulation laminar lens lifting force limb lungs Magnus effect mammals medullary bone metabolic modern birds movement moving muscles nerve ovary oxygen pecten penguin physiology of birds pigeon pressure primary feathers produced propulsion protein Pumphrey ratites region reproduction reptiles retina sea water seen shape skeleton skin slot speed stable stalling stream of air streamlined structure suggested surface tail take-off turbulence twist unstable flight vane vertebrates vitreous humour viviparity weight young bird