SIRS,- --In his " Survey of the Rooks in the Midlands," Mr. Roebuck deals (antea, p. 23) with the change in population on breeding. But in only a few lines he tells us that, after May, either a wholesale slaughter in some rookeries or a gradual fall in numbers in the others reduces the population by the end of August to the January total. It seems a pity that he does not provide anv of the evidence ...
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