Part 28

“Migration is a season full of peril for myriads of winged travellers, especially for those that cross large bodies of water. Some of the shore-birds, such as Plover and Curlew, which take long ocean voyages, can rest on the waves if overtaken by storms, but woe to the luckless warbler whose feathers once became water-soaked,—a grave in the ocean or a burial in the sand of the beach is the inevitable result. Nor are such accidents infrequent. A few years ago on Lake Michigan a storm during spring migration piled many birds along the shore.

“If such a disaster could occur on a lake less than a hundred miles wide, how much greater might it not be during a flight across the Gulf of Mexico. Such a catastrophe was once witnessed from the deck of a vessel, thirty miles off the mouth of the Mississippi River. Large numbers of migrating birds, mostly warblers, had accomplished nine-tenths of their long flight, and were nearing land, when they were caught by a ‘norther’ with which most of them were unable to contend, and, falling into the Gulf, were drowned by hundreds.

“Then, as I have told you before, birds are peculiarly liable to destruction by striking high objects. A new tower in a city kills many before the survivors learn to avoid it. The Washington Monument has caused the death of many little migrants; and though the number of its victims has decreased of late years, yet on a single morning in the spring of 1902 nearly 150 lifeless bodies were strewn around its base.

“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.

* * * * *

“Have you patience to follow the history of the flight of one bird? The longest migration route is taken by some of the wading-birds, especially the American Golden Plover, the Eskimo Curlew, and the Turnstone. The journey of the Plover, in itself like a fable, is wonderful enough to be told in detail.

“In the first week of June, they arrive at their breeding-grounds in the bleak, wind-swept ‘barren grounds’ above the Arctic Circle, far beyond the tree line. Some even venture 1000 miles farther north (Greely found them at latitude 81 degrees). While the lakes are still ice-bound, they hurriedly fashion shabby little nests in the moss only a few inches above the frozen ground. By August, they have hastened to Labrador, where, in company with Curlews and Turnstones, they enjoy a feast. Growing over the rocks and treeless slopes of this inhospitable coast is a kind of heather, the crowberry, bearing in profusion a juicy black fruit. The extravagant fondness shown for the berry by the birds, among which the Curlew, owing to its greater numbers, is most conspicuous, causes it to be known to the natives as the ‘curlewberry.’ The whole body of the Curlew becomes so saturated with the dark-purple juice that birds whose flesh was still stained with the colour have been shot 1000 miles south of Labrador.

“After a few weeks of such feasting, the Plovers become excessively fat, and ready for their great flight. They have reared their young under the midnight sun, and now they seek the southern hemisphere. After gaining the coast of Nova Scotia, they strike straight out to sea, and take a direct course for the easternmost islands of the West Indies. Eighteen hundred miles of ocean waste lie between the last land of Nova Scotia and the first of the Antilles, and yet 600 more to the eastern mainland of South America, their objective point. The only land along the route is the Bermuda Islands, 800 miles from Nova Scotia. In fair weather, the birds fly past the Bermudas without stopping; indeed, they are often seen by vessels 400 miles or more east of these islands.

“When they sight the first land of the Antilles, the flocks often do not pause, but keep on to the larger islands and sometimes even to the mainland of South America. Sometimes a storm drives them off the main track, when they seek the nearest land, appearing not infrequently at Cape Cod and Long Island.

“A few short stops may be made in the main flight, for the Plover swims lightly, and easily, and has been seen resting on the surface of the ocean; and shore-birds have been found busily feeding 500 miles south of Bermuda and 1000 miles east of Florida, in the Atlantic, in that area known as the Sargasso Sea, where thousands of square miles of seaweed teem with marine life.

“Though feathered balls of fat when they leave Labrador and still plump when they pass the Bermudas, the Plovers alight lean and hungry in the Antilles. Only the first, though the hardest, half of the journey is over. How many days it has occupied may never be known. Most migrants either fly at night and rest in the day or vice versa, but the Plover flies both night and day.

“After a short stop of three or four weeks in the Antilles and on the north-eastern coast of South America, the flocks disappear, and later their arrival is noted at the same time in southern Brazil and the whole prairie region of Argentina and Patagonia. Here they remain from September to March (the summer of the southern hemisphere), free from the responsibilities of the northern summer they have left. The native birds of Argentina are at the time engrossed in family cares; but, remember this well, no wayfarer from the north nests in the south; he has a second summer free from care!

“After a six months’ vacation the Plovers resume the serious affairs of life and start back toward the Arctic zone, but not by the same course. Their full northward route is a problem still unsolved. They disappear from Argentina and shun the whole Atlantic coast from Brazil to Labrador. In March they appear in Guatemala and Texas; April finds their long lines trailing across the prairies of the Mississippi valleys; the first of May sees them crossing our northern boundary; and by the first week in June they reappear at their breeding-grounds in the frozen North. What a journey! Eight thousand miles of latitude separates the extremes of their course, and 3000 miles of longitude constitutes the shorter diameter, and all for the sake of spending ten weeks on an Arctic coast! Do you realize this endurance when you see birds passing that window?

* * * * *

“As to the fatigue of the bird from travel, this is now thought to be very slight, as bird flocks that have crossed great bodies of water do not stop to rest, but usually continue many miles inland. It is, undoubtedly, accident or illness that sometimes causes birds to stop for rest on the rigging of vessels or offshore islands.

The Unknown

“Interest in bird migration goes back to a far distant period. Marvellous tales of the spring and fall movements of birds were spun by early observers, yet hardly less incredible are the ascertained facts. Much remains to be learned, and it may be of interest to note a few of the mysteries which still occupy attention. Even the daily flight of a bird is a wonderful thing apart from the endurance required in the long migrations. Though the wings of birds are built on very much the same plan, few species use them in precisely the same manner; while on a windy day the wings assume a dozen different positions in as many seconds, and to watch the flight of a sea-bird, as it rises and trims itself to the wind and then shapes its course, is to be awe-struck by this mysterious power of flight.

“Snap shot pictures of birds on the wing will show you this better than many words. Some birds, like the Hawks and Eagles, can sustain themselves in the air for hours, sailing against the wind without any visible motion of the wings. Others fly both by swift beating and sailing, like the Terns in one of these pictures.

“In short, the differences are so great that the Wise Men can often identify a bird by the sharp outline of its shadow in flight.

“This power of flight has been a subject of wonder for many thousand years; we think and we speculate, but no one has yet learned the secret in its fulness.