“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_