..."Resolved, That the migration or importation of slavesinto the United States, or any territory thereof, beprohibited after the first day of January, 1808... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...This barrier, then, seems to explain the absence of the horse among the Hottentots, though it is not opposed to the southern migration of cattle, sheep, and goats...
David Livingstone 「Missionary Travels and Researches in South Africa」
... Before we came to the Orange River we saw the last portion of a migration of springbucks ('Gazella euchore', or tsepe)...
David Livingstone 「Missionary Travels and Researches in South Africa」
...They are probably induced to make this migration by the increased rapidity of the current dislodging them from their old pasture-grounds higher up the river...
David Livingstone 「Missionary Travels and Researches in South Africa」
...They found partially disrupted Negro states on the west coastand falling empires in the Sudan, together with the old unrest ofover-population and migration in the valley of the Congo...
W.E.B. Du Bois 「The Negro」
...It was first thought to encourage migration to Sierra Leone, andeighty-eight Negroes were sent, but they were not welcomed...
W.E.B. Du Bois 「The Negro」
...North of the Zambesi, in British territory, the chief role in recenttimes has been played by the Bechuana, the first of the Bantu toreturn northward after the South African migration...
W.E.B. Du Bois 「The Negro」
...The Doukhobors: Their History in Russia; Their Migration to Canada...
Various 「Mother Earth, Vol. 1 No. 4, June 1906」
...It is theonly song to be heard in Italy at the time of the autum migration...
William T. Hornaday 「Our Vanishing Wild Life」
...In Venice, which was visited in October and November, during thefall migration, he found on sale in the markets, as food, thousandsof songbirds...
William T. Hornaday 「Our Vanishing Wild Life」
...
—The nighthawk, or bull-bat, also renders important service in the destruction of weevils, and catches them on the wing in considerable numbers, especially during its migration...
William T. Hornaday 「Our Vanishing Wild Life」
...Theseare the "Rail-birds" or "Ortolans" which are annuallyslaughtered by thousands, for sport and marketing, during their fall migration...
Chester A. Reed 「The Bird Book」
...It is found in open thorny woods and thickets; and in Buenos Ayresseems to have a partial migration, as it is much more common insummer than in winter...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...I had never beforeobserved any later or supplementary migration like this; for, as a rule,the causes which in some years delay the departure of birds seemsto affect them all alike...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...It has, I fancy, a limited migration, as I could neverfind one in winter...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...I have met with this bird at all seasons of the year in Patagonia on theRio Negro, and think it probable that it has no migration...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...In addition to the above he cites differences between thecarduelines and the "other" fringillids in the appendicular skeletons,in geographic distribution, in patterns of migration, and in habits...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...A quantitative study of the nocturnal migration of birds...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...Although June may be called the Month of Nests,nest-building begins long before the migration ends...
Frank M. Chapman 「What Bird is That?」
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