The Migrations of Birds

Arctic tern arrive Atlantic Australia barn swallow bird migration bird's birds banded breeding area breeding territory Canada climatic coast common chaffinches continent cross cuckoo cycle direction ducks east eastern European experiments factors flocks flycatcher flyway follow France geese Germany glands gonads hemisphere herons Hirundo influence invasions Island juncos land-birds landmarks large number magnetic Manx shearwaters Mediterranean meteorological migration routes migratory migratory behaviour migratory flights migratory impulse miles moult movements nesting normal North America northern number of birds observed orientation Ornithological ornithologists Palearctic Passerines period petrel physiological pituitary populations Procellariiformes Puffinus recoveries red-backed shrike regions rhythm Rüppell sea-birds seasonal flights shearwater shore-birds shrike south-east south-west southern sparrow species spring migration starlings storks swallows swift temperature thrushes thyroid variations Vogelwarte Vogelzug warblers weather western Europe Wilson's petrel winds winter quarters yellow wagtail young birds Zealand zone Zool