Well, migration is basically movement and you might use that by saying," The migration of birds has caused pollution to spread around".
migrate!
animal husbandry, combustion, flame, migration, etc...
Counter migration- migration in the opposite direction. Counter Migration - forced migration of immigrants to return to their country of origion
Depends on what you mean... but I'll try.There is migration, chain migration, forced migration, voluntary migration, net-in migration, net-out migration, immigration, emmigration, countermigration.These are Human Geographic terms by the way. That makes about 9 types of migration.
Demography is the science that studies trends and changes in human populations, such as birth rates, death rates, and migration patterns. It examines how populations grow, decline, and distribute geographically over time.
Migration to the east
The plural form of migration is migrations.
Internals migration
migration that is temporary
forced migration.
the massive migration has begun. Birds also show migration to survive.