irruption - définition. Qu'est-ce que irruption
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Qu'est-ce (qui) est irruption - définition

MOVEMENT OF ANIMALS FROM PLACE TO PLACE, USUALLY SEASONAL
Animal Migration; Migration of animals; Irruption; Animal migrate; Migration pattern; Migration patterns; Migratory pattern; Migratory animals; Seasonal migration
  • Flocks of birds assembling before migration southwards
  • [[Christmas Island red crab]]s on annual migration
  • High-mountain [[shepherd]]s in [[Lesotho]] practice [[transhumance]] with their flocks.
  • spawn]]
  • monarch]], tagged for identification
  • An aggregation of migratory ''[[Pantala flavescens]]'' dragonflies, known as globe skimmers, in [[Coorg]], India
  • [[Mexican free-tailed bat]]s on their long aerial migration
  • Serengeti 'great migration']]

irruption         
n. an irruption into
irruption         
n.
1.
Bursting in, breaking in.
2.
Incursion, inroad, foray, raid, partial invasion.
Irruption         
·noun A bursting in; a sudden, violent rushing into a place; as, irruptions of the sea.
II. Irruption ·noun A sudden and violent inroad, or entrance of invaders; as, the irruptions of the Goths into Italy.

Wikipédia

Animal migration

Animal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. It is the most common form of migration in ecology. It is found in all major animal groups, including birds, mammals, fish, reptiles, amphibians, insects, and crustaceans. The cause of migration may be local climate, local availability of food, the season of the year or for mating.

To be counted as a true migration, and not just a local dispersal or irruption, the movement of the animals should be an annual or seasonal occurrence, or a major habitat change as part of their life. An annual event could include Northern Hemisphere birds migrating south for the winter, or wildebeest migrating annually for seasonal grazing. A major habitat change could include young Atlantic salmon or sea lamprey leaving the river of their birth when they have reached a few inches in size. Some traditional forms of human migration fit this pattern.

Migrations can be studied using traditional identification tags such as bird rings, or tracked directly with electronic tracking devices. Before animal migration was understood, folklore explanations were formulated for the appearance and disappearance of some species, such as that barnacle geese grew from goose barnacles.