... When first he came upon them they were moving slowly butsteadily southward in one of those periodic migrations the reasons forwhich the baboon himself is best able to explain... 
Edgar Rice Burroughs 「The Son of Tarzan」
...You may have observed, in the history of the world, that the migrations of the human race are generally from the north to the south: so it appears to have been in Africa...
Captain Frederick Marryat 「The Mission; or Scenes in Africa」
...The exact limits of theseannual migrations are unknown; it is, however, probable that in thenorth they never go beyond the banks of the Rio Bravo, at least in theStates of Cohahuila and Texas...
William T. Hornaday 「The Extermination of the American Bison」
...Although the birds areabundant during migrations,they seem to suddenly andstrangely disappear duringthe breeding season...
Chester A. Reed 「The Bird Book」
...During migrations they are found inequal abundance in swamps or orchards...
Chester A. Reed 「The Bird Book」
...Among the insects such migrations have beenfrequently noticed, and the phenomenon has apparentlybeen observed oftener among the butterflies than in anyother group...
Clarence M. Weed 「Butterflies Worth Knowing」
...The migrations thus considered are only exceptionaloccurrences...
Clarence M. Weed 「Butterflies Worth Knowing」
...It arrives from the northin September, and is very regular in its migrations, although apparentlya very feeble flier...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...But during their migrations,and in winter, when several forms may be associated, it isusually not possible to identify them in the field...
Frank M. Chapman 「Color Key to North American Birds」
...With this separate familylife there is still in most species of birds concerted action bycommunities in migrations, in forming colonies, in attacks on othercreatures, and in defense from enemies...
John H. Robinson 「Our Domestic Birds」
...They can do it because of their perfect discipline, or instinct, or the perfection of the system they follow during their autumn and winter wanderings and migrations...
W. H. Hudson 「Birds in Town and Village」
...They have no migrations likethe passenger pigeon once so plentiful in the easternstates, nor do they congregate in such immense flocks...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...In its former state, the larva, subject tostrange migrations, obviously needs the sense of sight and isprovided with four ocelli...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...From other sources I learned thatsmall numbers occasionally pass along the outskirts of Churchill duringthe migrations...
Francis Harper 「The Barren Ground Caribou of Keewatin」
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