. Bird-lore . where the rigors of nature forbade them toprocreate. Thus they gradually succumbed to the ine\atable and passed intothe unknown. Were it possible to obtain an accurate record of the receipts ofPigeon shipments in the markets of the larger cities only from 1870 to 1895,the enormous numbers sold and the gradual decrease in the sales would ex-hibit, in the most graphic and convincing manner possible, the chief cause ofthe passing of the Passenger Pigeon. Whib we have been wondering why the Pigeons disappeared, the marketshave been reaching out for sometliing to take their place, and
. Bird-lore . where the rigors of nature forbade them toprocreate. Thus they gradually succumbed to the ine\atable and passed intothe unknown. Were it possible to obtain an accurate record of the receipts ofPigeon shipments in the markets of the larger cities only from 1870 to 1895,the enormous numbers sold and the gradual decrease in the sales would ex-hibit, in the most graphic and convincing manner possible, the chief cause ofthe passing of the Passenger Pigeon. Whib we have been wondering why the Pigeons disappeared, the marketshave been reaching out for sometliing to take their place, and we have wit-nessed also the rapid disappearance of the Eskimo Curlew, the Upland Plover,the Buff-breasted Sandpiper, and the Golden Plover, from the same we awake in time to save any of these birds, or the many others thatare still menanced with extinction by this great market demand? No hopecan be held out for the future of these birds until our mar-kets are closed tothe sale of native wild The Migration of North American Sparrows TWENTY-FIRST PAPERCompiled by Professor W. W. Cooke, Chiefly from Data in the Biological Survey With drawings by Louis Agassiz Fuertes(See Frontispiece) FOX SPARROW In the eastern United States, the Fox Sparrow winters from the valleysof the Potomac and Ohio Rivers to the Gulf States; it breeds throughout thelarger part of Canada. The birds of the region from the Rocky Mountainsto the Pacific have been separated into seven subspecies. Some of these forms,breeding from California to Colorado, are almost non-migratory, makingshort journeys from the mountains where they nest to the warmer valleys ISOCHRONAL MIGRATION LINES OF THE FOX SPARROW(104) The Migration of North American Sparrows los for the winter. Three forms, breeding in Alaska, come south in winter toCahfornia; but not enough data have as yet been secured to formulate theirtimes of migration. Nearly all of the dates gi\en in the following tables referto the eastern bird, a
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