Alright. But maybe my idea of migration is different than yours? A group of deer moving from one watering spot to another, or one grass field to another imo is not migration...
My idea of migration is more along the lines of Deer living up in mountains during summer/spring and moving to the valleys below for fall/winter. Which this is not a 'lets majority decide to go' type of situation. This is an if we don't go, we will freeze to death and die...
Basically moving to a new area to live in, not just a new spot to eat/drink.
What you described imo appears to be something that is just a normal daily routine, not really migration.
It is interesting that they do not move until there is a +50% consensus that it's safe, which I never knew they did. But I would not really call that voting either. This is more of a...herd mentality. Lets all be sheep...baah...baah
And all it takes is one deer or most any animal to look at something, and a chain reaction will occur because all the rest want to know what is going on...