Show migratory bird flyways ducks and other wild fowl travel trave from north to south and then back bach again as as seasons change changeover over tour four favored rout routes wll which chr are III 1 along the atlantic seaboard 2 down the tha mississippi valley 3 from canada to montana and then directly south or southeast into the gulf cl mexico area rea 4 the pacific slope dope only explanation for or the migrations ol of some birds Is heredity most are born in the north and many breeds date back to the ne age |