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So we see that broad-front migration tends to be the general rule, and it is probable that the birds drift northwards for the main part of the journey more or less as individual figures. Naturally as they near their breeding haunts, the possibility of linking with more of their fellows increases, but as far as the spring migration is concerned we rarely see, in the passerine birds, the large migratory flocks which often characterise the autumn flight, and it is usual for the birds to drift in in ones and twos. |
