. Common birds of town and country . TWO OF THE PRINCIPAL MIGRATION ROUTES -OE THE PALM WARBLER They winter in the Gulf States from Louisiana eastward and throughout the GreaterAntilles to Porto Rico. The Louisiana birds nest in Labrador, and those from the Antillescut diagonally across the United States to summer in central Canada. The two routes crosseach other in Georgia at approximately right angles. the work of migration. It keeps alongthe insect-teeming shores, and the 2,000extra miles thereby added to the migra-tion route are but a tithe of the distancecovered in pursuit of its daily fo
. Common birds of town and country . TWO OF THE PRINCIPAL MIGRATION ROUTES -OE THE PALM WARBLER They winter in the Gulf States from Louisiana eastward and throughout the GreaterAntilles to Porto Rico. The Louisiana birds nest in Labrador, and those from the Antillescut diagonally across the United States to summer in central Canada. The two routes crosseach other in Georgia at approximately right angles. the work of migration. It keeps alongthe insect-teeming shores, and the 2,000extra miles thereby added to the migra-tion route are but a tithe of the distancecovered in pursuit of its daily food. IDIOSYNCRASIES IN MIGRATION ROUTES How migrating birds find their wayover the widespread regions lying be-tween their winter and summer homeshas always been one of the tantalizing 353 THE NATIONAL GEOGRAPHIC MAGAZINE. THE CONNECTICUT WARMER CHOOSES A DIFFERENT ROUTE TO RETURN TO ITS WINTERHOME THAN IT USED WHEN LEAVING IN SPRING (SEE PAGE 355) problems of the migration student. Afavorite theory of the past, and one stillclaiming many advocates, is that rivervalleys and mountain chains form con-venient highways along which the birdstravel in the spring, and which are easilyrecognized on the return trip. The incorrectness of this theory (at least with reference to some species) isproven by the migration routes of thepalm warblers. They winter in the GulfStates from Louisiana eastward andthroughout the Greater Antilles to PortoRico. They nest in Canada from theMackenzie Valley to Newfoundland. Tocarry out the above theory, the Louisiana
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