“Bright lights attract birds from great distances. While the torch in the Bartholdi Statue of Liberty in New York Harbor was kept lighted, the sacrifice of life it caused was enormous, even reaching a maximum of 700 birds in a month. A flashing light frightens birds away, and a red light is avoided by them as if it were a danger signal, but a steady white light looming out of mist or darkness seems to act like a magnet and draws the wanderers to destruction. Coming from any direction, they veer around to the leeward side, and then, flying against the wind, dash themselves against the pitiless glass.
Distance of Migration
“The length of the migration journey varies enormously. Some birds do not migrate at all. Many a Cardinal, Carolina Wren, and Bob-white rounds out its whole contented life within ten miles of its birthplace. Other birds, for instance, the Pine Warbler and the Black-headed Grosbeak, do not venture in winter south of the breeding range, so that with them fall migration is only a withdrawal from the northern and a concentration in the southern part of the summer home—the Warbler in about a fourth and the Grosbeak in less than an eighth of the summer area.
“The next variation is illustrated by the Robin, which occurs as a species in the middle districts of the United States throughout the year, in Canada only in summer, and along the Gulf of Mexico only in winter. Probably no individual Robin is a continuous resident in any section; but the Robin that nests, let us say, in southern Missouri will spend the winter near the Gulf, while his hardy Canada-bred cousin will be the winter tenant of the abandoned summer home of the southern bird.
“Most migrants entirely change their abode twice a year, and some of them travel immense distances. Of the land-birds, the common eastern Night Hawk seems to deserve the first place among those whose winter homes are widely distant from their breeding-grounds. Alaska and Patagonia, separated by 115 degrees of latitude, are the extremes of the summer and winter homes of the bird, and each spring many a Night Hawk travels the 5000 miles that lie between. But some of the shore-birds are still more inveterate voyagers. These cover from 6000 to 8000 miles each way, and appear to make travelling their chief occupation.
Routes of Migration
“Birds often seem eccentric in choice of route, and many land-birds do not take the shortest line. The fifty species from New England that winter in South America, instead of making the direct trip over the Atlantic, involving a flight of 2000 miles, take a slightly longer route which follows the coast of Florida, and passes thence, by island or mainland, to South America. What would seem, at first sight, to be a natural and convenient migratory highway extends from Florida through the Bahamas or Cuba to Haiti, Porto Rico, and the Lesser Antilles, and thence to South America.
The Bobolink Route
“Chief among these dauntless voyagers is the Bobolink, fresh from despoiling the Carolina rice-fields, waxed fat from his gormandizing, and so surcharged with energy that the 500-mile flight to South America on the way to the waving pampas of southern Brazil seems a small hardship. Indeed, many Bobolinks appear to scorn the Jamaican resting-point and to compass in a single flight the 700 miles from Cuba to South America. With the Bobolink is an incongruous company of travelling companions—a Vireo, a King Bird, and a Night Hawk that summer in Florida; the queer Chuck-will’s-widow of the Gulf States; the two New England Cuckoos; the trim Alice’s Thrush from Quebec; the cosmopolitan Bank Swallow from frozen Labrador, and the Black-poll Warbler from far-off Alaska. But the Bobolinks so far outnumber all the rest of the motley crew that the passage across the Caribbean Sea from Cuba to South America may with propriety be called the ‘Bobolink route.’ Occasionally a mellow-voiced Wood Thrush joins the assemblage, or a green-gold Tanager, which will prepare in its winter home its next summer livery of flaming scarlet. But the ‘Bobolink route,’ as a whole, is not popular with other birds, and the many that traverse it are but a fraction of the thousands of North American birds that spend the winter holiday in South America.