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Wildebeest migrating in the Serengeti. Migration, in ecology, is the large-scale movement of members of a species to a different environment.Migration is a natural behavior and component of the life cycle of many species of mobile organisms, not limited to animals, though animal migration is the best known type.
[2] [3] [4] As such, there is no simple accepted definition of migration. [5] One of the most commonly used definitions, proposed by the zoologist J. S. Kennedy [ 6 ] is Migratory behavior is persistent and straightened-out movement effected by the animal's own locomotory exertions or by its active embarkation on a vehicle.
Human migration is the movement of people from one place to another, [1] with intentions of settling, permanently or temporarily, at a new location (geographic region). The movement often occurs over long distances and from one country to another (external migration), but internal migration (within a single country) is the dominant form of human migration globally.
Animal migration; Bird migration; Plant migration, see Seed dispersal, the movement or transport of seeds away from the parent plant; Gene migration, a process in evolution and population genetics; Cell migration, a process in the development and maintenance of multicellular organisms Collective cell migration, describing the movements of group ...
Studies show that the pre-modern migration of human populations begins with the movement of Homo erectus out of Africa across Eurasia about 1.75 million years ago. Homo sapiens appeared to have occupied all of Africa about 150,000 years ago; some members of this species moved out of Africa 70,000 years ago (or, according to more recent studies, as early as 125,000 years ago into Asia, [1] [2 ...
For example, in Armenia, everything is localized in the capital city Yerevan, thus, internal migration is from the villages and small cities to the biggest city of the country. The reason for the migration can be work or study. International migration follows the same reasoning of migration: work or study.
In population genetics, gene flow (also known as migration and allele flow) is the transfer of genetic material from one population to another. If the rate of gene flow is high enough, then two populations will have equivalent allele frequencies and therefore can be considered a single effective population.
Net migration rates per 1,000 people in 2023. On net people travel from redder countries to bluer countries. Legal status of persons Birthright Birthplace Aboard aircraft and ships Jus sanguinis Jus soli Birth tourism Nationality Citizenship missing multiple transnational Naturalization Ius Doni Oath Test Law Lost citizenship denaturalized renounced Immigration Alien Enemy Criminalization ...