The Greatest Migration was not one year. It was from 1940-1970.
Population growth was greatest during the 20th century, especially post-1950s, with advancements in healthcare, technology, and sanitation leading to lower mortality rates and increased life expectancy, resulting in exponential population growth.
622
migrate is a verb, it expresses action. 'They migrate every year.' migration is a noun, it express a thing. 'Every year there is a massive migration.
It allows them to travel to areas of greatest resources to survive.
1975
The telegraph
Midwest
Arctic Tern (the world's greatest migrator, arctic to antarctic. Caribou
The Arctic tern holds the long-distance migration record for birds. The bird is recorded for travelling between Arctic breeding grounds and the Antarctic each year.
There is no migration in Antarctica: it is not home to any animal.
Arctic Tern (the world's greatest migrator, arctic to antarctic. Caribou
The wildebeest migration in the Masai Mara typically occurs between July and October, with the peak of the migration occurring in August and September. However, the timing of the migration can vary slightly from year to year depending on factors such as rainfall and grass growth.