CONTENTS 



PAGE 



PREFACE . . . , . . . . . . .57 



INTRODUCTORY REMARKS . . . . . . .59 



SUPPOSED ACCIDENTAL VISITORS . . . .... .61 



INTRODUCED- SPECIES . . . . . ... 62 



SUBSPECIES . 62 



GEOGRAPHICAL DISTRIBUTION OF BIRDS WITHIN THE BRITISH 



ISLANDS . 63 



RESIDENTS .......... 65 



SUMMER VISITORS . . . . . . . .69 



WINTER VISITORS . . . . . . . .70 



SPRING AND AUTUMN MIGRANTS . . . . . .73 



ACCIDENTAL VISITORS ........ 74 



GEOGRAPHICAL DISTRIBUTION OF BRITISH BIRDS DURING THE 



BREEDING SEASON OUTSIDE THE BRITISH ISLANDS . .79 

 ClRCUMPOLAR AND ClRCUMTROPIC SPECIES . . . .80 



NEARLY CIRCUMPOLAR SPECIES . . . . . .83 



' NORTH ATLANTIC SPECIES . . . . . . .84 



NEARCTIC SPECIES . . . .... . .85 



PAL^ARCTIC SPECIES . . . . . . . 86 



WEST PALJEARCTIC SPECIES . . . . . . .90 



SPECIES RANGING EAST TO 110 . . . . .90 



SPECIES RANGING EAST TO 85 . . . . .92 



SPECIES RANGING EAST TO 70 . ; . . . .93 



SPECIES BANGING EAST TO 60 . ... 95 



SPECIES RANGING EAST TO 50 . . . . .95 



SPECIES CONFINED TO WESTERN EUROPE . . .96 

 EAST PAL^ARCTIC SPECIES . . . . . . .97 



CENTRAL PAL^ARCTIC SPECIES . . . . . .98 



CLIMATIC DISTRIBUTION OF BRITISH BIRDS DURING THE BREEDING 



SEASON ... 99 



