I would like to mimic a migration of a dozen of animals over a vast area.
I would like those animals to move back and forth from one area to another and I would like them to do so at the very same time so the impression of a herd moving is mimic.

What should be the best and simpler way?

Thanks for your help...

AI packages.

Just chose one from the herd as a leader and give him travel package with certain conditions to move between various points at specific times. And for the rest of animals give them follow package which points to a leader.

Thanks Man, I am in a process of doing so and will keep you posted...