In February, the rooks pay visits to their home-trees, wheeling and
squawking round about, and demolishing old nests. On fine February
evenings they linger after sunset before setting off to their winter
roosting-place. A few, who have begun work on new nests, turn back to
the trees undecided, then turn again after their companions. Not until
the beginning of March do the rooks seriously set about their building,
in mid-March deserting the great roosting-places of winter and mounting
guard over their rough nests of sticks.
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