But what distinguishes the rook from the crow is the bill; the nostrils, chin, and sides of that and the mouth being in old birds white and bared of feathers, by often thrusting the bill into the ground in search of the erucæ of the Dor-beetle*; the rook then, instead of being proscribed, should be treated as the farmer's friend; as it clears his ground from caterpillars, that do incredible damage by eating the roots of the corn.