Legionary:I voted for a combination again.
As in real life, most animals tend to stay away from humans due to our own aggressive nature. However, there are a few rare intances where animals have attacked humans unprovoked.
So, my idea is to have maybe 90% of the animals as defensive, while having the remainder being aggressive. Just thought I'd throw it out there.
No, they stay away cause we smell bad :)
Combination, some animals wonder around the map attacking small groups of soldiers, or just going around them. And others are territorial, and if you come into their territory you dead or they are no middle ground.
And then you should have like herds of cows that wonder around the map, and will stampede in any old direction if fighting starts near them.
"Do not die a coward, a villan, or a hero, die a servant who dies for others"

Check out my story, earth in flames, the occupation of earth.