Immigrants move from one place to another. Generally speaking, it refers to the long-distance round-trip migration of a certain creature or bird between the breeding area and the wintering area in spring and autumn. To survive, move from one place to another regularly or regularly. Like spring, migratory birds migrate back.

Animal migration

Animal Migration is a book published by Hubei Education Press in May 2009. The author is German animal ecologist Weitus Pi de Lauscher, the painter is German Manfred Topher, and the translator is Li. The book tells the amazing and interesting migration behaviors of various animals, including mammals, fish, amphibians, reptiles and insects.

The book not only explains why animals have to make such a difficult migration, but also analyzes the incentives to awaken animals to "migration restlessness". With a large number of color photos and illustrations, readers will have a better understanding of animal migration. Mammals also migrate periodically because of seasons, reproduction and foraging.

For example, northern reindeer migrate south to coniferous forests in winter and return to the food-rich northern tundra in spring. In addition to level of migration, there is vertical migration. For example, in the cold season in mountainous areas, animals often move to low-lying areas in search of food. Many deep-sea fish and invertebrates spend part of a year in deep sea and shallow sea respectively.