Two centuries of mass migration offers insights into the future of global movements of people World migration has been going on for centuries, and free mass migration—of those not coerced, like slaves ...

A map showing net migration (recorded population change minus natural growth), with blue showing areas of positive net migration and red showing negative net migration. Disclaimer: AAAS and ...

An interactive map traces the spring 2025 migration north of hummingbirds. The birds are projected to arrive in Michigan later this spring. Michigan bird lovers, now's your chance to keep an eye ...