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www.reference.com/article/migration-map-1d3ba96acb062b58

A migration map displays how populations move between geographic areas. This type of map allows viewers to visualize and track population trends among humans, animals and diseases.

www.reference.com/article/great-migration-912e894515c6928c

The Great Migration was a large movement of African American people out of the southern United States after Reconstruction. This movement lasted from around 1915 through the 1960s. During this time, over 6 million people moved north and west toward urban areas, creating a new black urban culture.

www.reference.com/world-view/people-migrate-976c1f22c71e3af6

Human migration is a complex behavior with many causes, but at its root it usually occurs because people believe they are leaving a bad situation for a better one. War, poverty and lack of opportunity are common causes of migration.

www.reference.com/article/causes-migrations-3ac624ec80d57568

Migrations are caused by poverty, armed conflicts, economic hardships, political unrests and social persecution. The 2015 Syrian migration is due to the civil war taking place in the country. These migrants are fleeing the region to escape death and destruction.

www.reference.com/article/big-sharks-b88afc83175f69a7

The size of a shark depends on its species. The largest living shark, the whale shark, averages 31.82 feet long. The extinct megalodon was even bigger at about 60 feet long. The smallest shark is the dwarf lanternshark, which is only 6.7 inches long.

www.reference.com/article/sharks-located-a4ef223442d49323

Sharks live in every ocean of the world, with most species occupying waters no deeper than 7,000 feet. The Portuguese dogfish is the deepest-living shark and can be found at a depth of 12,000 feet. Some sharks, such as the bull shark, are capable of surviving in fresh water.

www.reference.com/article/different-types-migration-512ac13233501aae

Landscape Research lists the types of migration as labor, forced, international, internal, voluntary and inter-regional migration. Animals and birds normally migrate due to changes in environmental conditions and the need for reproduction. Human beings may migrate in search for better socioeconomic

www.reference.com/article/sharks-move-ebb093b7a38ad8f0

Sharks move through the water with the help of their tail fins. The body of a shark is light as it is made of cartilage and not bones. It has a perfectly streamlined body. Its dorsal fins help it steer through the water.

www.reference.com/pets-animals/many-sharks-world-8638e82d84a416d1

There are approximately 470 known species of shark in the world, but it's impossible to count the exact number of individual sharks on the planet. World Wildlife Fund estimates that more than 100 million sharks are killed each year for their fins.

www.reference.com/article/animals-migrate-553bca278450d090

There is no universally accepted reason or definition for migration, but it is widely believed that animals move from one place to another to find more comfortable weather, to seek more food and to reproduce. Many animals travel far distances in groups in order to survive and thrive.