Only in the last few years have we obtained records to show the origin of our winter immigrant Rooks, but the information is now gradually accumulating. So far we have no ringing record of a British-bred Rook migrating oversea.*For previous parts see Vol. XXV., pp. 110-128 ; 174-192; 245-268; 357-360. Vol. XXVI., pp. 352-361. fWe have had lantern slides prepared of some 25 maps illustrating this s...

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