. The book of birds : common birds of town and country and American game birds . o MO < g o«o wK ow ooo w W5 /—V <u in C 9O ° Mbo O. .5 «j S^1=1 . u■^(^ ^£1^ C n! .2 5 wo < < w <u W u c: E ^ Is 60 1- C OUR GREATEST TRAVELERS 195 a day for the next 20 days, while it isrounding the western end of the Gulf ofMexico. It more than doubles this ratewhile passing up the Mississippi andOhio rivers. The crossing of the Alle-ghany Mountains comes next, and thereare only 200 miles of progress to showfor the 10 days of migration. By thistime spring has really come east of theAlleghanie
. The book of birds : common birds of town and country and American game birds . o MO < g o«o wK ow ooo w W5 /—V <u in C 9O ° Mbo O. .5 «j S^1=1 . u■^(^ ^£1^ C n! .2 5 wo < < w <u W u c: E ^ Is 60 1- C OUR GREATEST TRAVELERS 195 a day for the next 20 days, while it isrounding the western end of the Gulf ofMexico. It more than doubles this ratewhile passing up the Mississippi andOhio rivers. The crossing of the Alle-ghany Mountains comes next, and thereare only 200 miles of progress to showfor the 10 days of migration. By thistime spring has really come east of theAlleghanies, and the swallow travels 60miles a day to its summer home in NovaScotia. It is to be noted that the swallow, likethe robin and the black-poll warbler,works up to high rates of speed when itis traveling on a diagonal, and that exceptduring the 10 days spent in crossing themountains, each 10 days travel coversapproximately five degrees of latitude. SOME NARROW MIGRATION ROUTES The accompanying illustration of therange of the scarlet tanager (page 194)is given to show the narrowness of themigration route as compared with thewidth of the summer and winter tanager
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, bookyear1921
