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PART ONE MIGRATION
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amateur animals anticyclonic arrival autumn beak behaviour Bird Migration bird-watchers breeding Britain British Birds British Birds magazine British Trust Cap Gris Nez Chaffinches coast Darwin Darwin's finches density detected by radar drift East Anglia easterly winds echoes Edward Grey Institute eggs England evidence evolution evolved feet following wind full overcast further Galapagos heading height Hence Holland Huxley's Ibis insects islands Julian Huxley June and July juvenile land Lapwings later light migration morning move natural selection naturalist nearly nest night night-migrants Norfolk normally North Sea northerly wind northward observations occurred ornithology Oxford paper passerine presumably radar record reason ringed robin Scandinavian scientific Selous shows southerly southern southward species spring Starlings Straits of Dover Suffolk summer Sussex Swifts T. H. Huxley thrushes tion Trust for Ornithology Tucker usually waders warblers weather westerly westward winter zoologists