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actual adapted adult Africa aggressive behaviour animals appetative behaviour ARCHAEORNIS barbs bill BIRD BEHAVIOUR bird migration BIRDS DIFFER birds fly birds of prey birds travel birds which breed body temperature bones Bredasdorp breeding quarters Broekhuysen chick colony colour consummatory act courtship behaviour day-time developed in birds different species DIGESTIVE displacement behaviour distance distress call duck duckling dummy egg egg-shell ethologist European Bee-eater European Stork external factors feeding female Flamingo flight Gannet glands gonad HARTLAUB'S GULL hatch homing pigeon Incubation innate behaviour pattern innate motor pattern legs long-call lungs male Mallard mammals migratory birds migratory species migratory urge moult nest night observation oesophagus Orange-breasted Sunbird orientate passerines pituitary posture recoveries Red-backed Shrike releaser result ringing of birds seed-eating shaft shown South African species of birds specific action potential starlings stimulation study of bird Swallow tail Tinbergen type of behaviour type of learning waders wing pattern young