Not only is the pest carried from place to place, but it also migrates, and in 1907 it crossed from Louisiana, where it first appeared in 1905, to Mississippi.
Occasionally the fluke migrates into the blood vessels and may reach the lungs, kidneys, urethra and bladder.
Mimus polyglottus, the northern mocking-bird, inhabits the southern part of the United States, being in the north only a summer visitant; it breeds rarely in New England, is seldom found north of the 38th parallel, and migrates to the south in winter, passing that season in the Gulf States and Mexico.
Formerly it was the general belief that the herring inhabits the open ocean close to the Arctic Circle, and that it migrates at certain seasons towards the northern coasts of Europe and America.
In habits it is very similar to its congener of the Old World, and in winter it migrates to the Antilles and to Central and South America.
Ments, is vested in the governor-general in council, commonly known as " the Government of India," which has its seat at Calcutta during the cold season from November to April, and migrates to Simla in the Punjab hills for the rest of the year.