...Like the lemmings of Norway andLapland, they migrate in vast numbers on the occurrence of ascarcity of their ordinary food...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...When the moles have eaten all the grubs and the wormsin a certain space, they migrate to another, and repeat theirgratuitous work...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...In summer when the sheep are driven up into the mountains, the coyotes migrate to those sections and kill sheep whenever the opportunity is presented...
A. R. (Arthur Robert) Harding 「Wolf and Coyote Trapping」
...In some sections they remain in the same locality during the entire year; in other places they migrate on the approach of cold weather and do not return until spring...
Elmer Harry Kreps 「Science of Trapping」
...The number of migrantspecies doubtless will be greatly increased by field work at thosetimes when birds migrate...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...Wildducks are gregarious in their habits,and generally migrate in large flocks...
Robert Jennings 「Sheep, Swine, and Poultry」
...So he is a migratorywoodpecker, though the woodpeckers are naturallyhome-loving birds, and do not migrate frompreference...
Fannie Hardy Eckstorm 「The Woodpeckers」
...Towards autumn, Pied Wagtails for the most part migrate southwards...
Rev. C. A. Johns 「British Birds in their Haunts」
...In North Britain, at the approachof severe weather, they flock together and migrate southwards...
Rev. C. A. Johns 「British Birds in their Haunts」
...Sandpipers do not congregate like many others of the Waders;they come to us generally in pairs, and do not appear to flock togethereven when preparing to migrate...
Rev. C. A. Johns 「British Birds in their Haunts」
...The factis that while the Canada goose is quite common on thecoasts of Mexico, neither the Hutchins goose nor thewhite-cheeked goose migrate that far south...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Whether theyremain near the mouths of the streams, or whetherthey migrate to distant feeding grounds are questionsthat have never been solved...
Harry Thom Payne 「Game Birds and Game Fishes of the Pacific Coast」
...Flieswill lay their eggs on the manure as usual, but the maggots, whenthey have finished feeding and begin to migrate, crawl out of themanure, drop into the water below, and are drowned...
L. O. Howard and F. C. Bishopp 「The House Fly and How to Suppress It」
...When the Caribou migrate northward through the Nueltin Lake region inMay and June, they still retain their winter pelage...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...Some animals remain aslate as November, but the majority migrate south to temperateor tropical waters in the early fall...
Stephen Leatherwood 「Whales, Dolphins, and Porpoises of the Western North Atlantic」
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