Classicly

The night was dark and bitter cold, though it was early March. Over in the dismal depths of Pigeon Swamp, where no pigeons have nested for nearly a half century though it is as wild and lone to-day as it was when they flocked there by thousands, a deep-toned, lonely cry resounded. The crows are cannier still. You will hardly find eggs in their nests hereabouts before the fifteenth of April, and you will do well to postpone your hunting till the twenty-fifth. Yet they all know, as well as I do, when the spring is near, and I think I have the secret of the message which has come to them. It is not the fact that a south wind has blown, for this may happen at any time during the winter, but it is something that reaches them on the wings of this same south wind.