Mass migrations of humans often occur do to negative pressures such as environmental crises, overpopulation, or war. Some of the largest mass migrations in history have taken place within the lifetime ...

Humans have always migrated to survive. When glaciers advanced, when rivers dried up, when cities fell, people moved. Their journeys were often painful, but necessary, whether across deserts, ...

There were 31 states that had population gains due to more people moving in from other states last year, according to new ...

WASHINGTON (AP) — Humans are the only animal that lives in virtually every possible environment, from rainforests to deserts to tundra. This adaptability is a skill that long predates the modern age.

Not long after humankind's emergence in Africa, Homo sapiens were off to explore the rest of the world. Yet, across the ancient timeline, the land that ancient humans walked upon was ever-changing.

This combination of 2007, 2018 and 2012 photos shows, from left, the Cederberg mountain range in South Africa, the Tenere desert in Niger and savanna in South Africa. (AP Photo/Schalk van Zuydam, ...