Analysis and a theory of visible bird migration [eider (Somateria mollissima), Common buzzard (Buteo buteo), honey buzzard (Pernis apivorus), sparrow hawk (Accipiter nisus), black-headed gull (Larus ridibundus), wood pigeon (Columba palumbus), swift (Apus apus), swallow (Hirundo rustica), hooded crow (Corvus coernix), jackdaw (Corvus monedula), yellow wagtail (Motacilla flava), starling (Sturnus vulgaris), chaffinch, brambling (Fringilla coelebs, montifringilla), siskin (Carduelis spinus), linnet (Carduelis cannabina)]

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