Flickr. (2021). Retrieved from https://www.flickr.com/photos/farflungphotos/25314 38211/in/photostream/
"Over 1.5 million wildebeest do an annual migration between the Serengeti in Tanzania and the Masai Mara in Kenya and risk death by drowning or from crocodiles as they cross the Mara river."
Scott, B. (2021). Flickr. Retrieved from https://www.flickr.com/photos/brianscott/1382977476
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Migration, in biology, is the movement of animals to a place that offers better living conditions. Many kinds of animals regularly migrate to avoid unfavorable changes in weather or food supply, or to take advantage of better living conditions elsewhere. Human beings also migrate, but they do so for political and social reasons as well as biological ones. For information on human migrations, see Immigration.
Biologists use the term migration to describe several types of movements. Some biologists, particularly those who study insects, refer to one-way journeys as migrations. Such movements take place when animals leave an area in search of better living conditions, and neither they nor their descendants necessarily return to the original area.
Other biologists refer to the long-term historical changes in the distribution of animals as migrations. But most biologists define migrations as regular, round-trip movements between two areas. Each area offers more favorable living conditions than the other at some point in the animals' lives. This article discusses such regular, round-trip migrations.
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