Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 637
ng migration is yet unknown, but in Marchthey appear in Guatemala and Texas. ByAprilthe long lines are winging their northward wayover the Mississippi prairies; early in May theyenter Canada; and by June the plovers are oncemore in the land of the midnight sun. Eightthousand miles they have flown… … THE BLUEBIRDS ARE FIRST TO RETURN IN SPRING. why any of the birds migrate. It is not alto-gether the food-supply, because many birds,which subsist on insects, begin to leave this coun-try in late July and August, just when their food-supply is most plentiful. Neither is it altogether
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