If the movement is more or less en masse (all the animals move the same way at the same time), it's a migration. These can be either recurring or permanent. If some animals sort of wander off to establish new territories while others stay on the home ground, it's called radiation.
a migration
The mass movement of a group of people out of a country is an exodus.
Movement is a study of migrations of people , animals,and even plants
Maasai people
He was in the expressionist group Der Blaue Reiter (The Blue Rider).
They followed the movement of the animals they hunted
exodus
to show the movement of information, goods or people between places and the amount being moved.
it's a big group of people or somtimes animals
Behavior
a industrial natation
an exodus