BOB, THE VAGABOND
Dolichonyx oryzivorus, the Bobolink.
Educational Leaflet No. 38. (National Association of Audubon Societies.)
The Bobolink Route
Maps, showing the route of migrant bobolinks may be found in Bird, Migration (Cooke), page 6;
Our Greatest Travelers (Cooke), page 365.
Other interesting accounts of bird-migrations may be found in Travels of Birds (Chapman).
Bird Study Book (Pearson), chapter IV.
History tells us when Columbus discovered Cuba and when Sebastian Cabot sailed up the Paraguay River; but when bobolinks discovered that island, or first crossed that river, no man can ever know. The physical perfection that permits such journeys as birds take is cause for admiration. In this connection much of interest will be found in
The Bird (Beebe), chapter VII, "The Breath of a Bird," from which we make a brief quotation. "Birds require, comparatively, a vastly greater strength and 'wind' in traversing such a thin, unsupporting medium as air than animals need for terrestrial locomotion. Even more wonderful than mere flight is the performance of a bird when it springs from the ground, and goes circling upward higher and higher on rapidly beating wings, all the while pouring forth a continuous series of musical notes.... A human singer is compelled to put forth all his energy in his vocal efforts; and if, while singing, he should start on a run even on level ground, he Would become exhausted at once.... The average person uses only about one seventh of his lung capacity in ordinary breathing, the rest of the air remaining at the bottom of the lung, being termed 'residual.' As this is vitiated by its stay in the lung, it does harm rather than good by its presence.... As we have seen, the lungs of a bird are small and non-elastic, but this is more than compensated by the continuous passage of fresh air, passing not only into but entirely through the lungs into the air-sacs, giving, therefore, the very best chance for oxygenation to take place in every portion of the lungs. When we compare the estimated number of breaths which birds and men take in a minute,—thirteen to sixteen in the latter, twenty to sixty in birds,—we realize better how birds can perform such wonderful feats of song and flight."