Most animals that live in groups have a “Pecking Order”. It’s no more than a hierarchical system of social organization within the group. Every member has his place. Get out of place and you’re put back in it.
As for prey following predator, it’s common in many animals. If you know where your enemy is, there’s less danger of you being victim of a surprise attack. Very common on the African plains.
Those who beat their guns into plows, will plow for those who don't.-Thomas Jefferson