Many of the animals in game will fight even if they wouldn't do so in nature.
for example:
Saltwater crocks are fine with multiple female crocksr
Okapi should only get (more easily) stressed when too many individuals are in the habitat, not fight, a large enough habitat should reduce the stress
lemur groups shouldn't fight at all, this is what wiki says: Troops are classified as multi-male groups, with a matriline as the core group.[39] As with most lemurs, females socially dominate males in all circumstances, including feeding priority. Dominance is enforced by lunging, chasing, cuffing, grabbing and biting. Young females do not always inherit their mother's rank and young males leave the troop between three and five years of age. Both sexes have separate dominance hierarchies; females have a distinct hierarchy while male rank is correlated with age.
Wolves should not fight at all either, but mating should be monogamous
antelope groups should not have dominance fights more than once. the males in thous groups just don't mate in nature
+ many many more
for example:
Saltwater crocks are fine with multiple female crocksr
Okapi should only get (more easily) stressed when too many individuals are in the habitat, not fight, a large enough habitat should reduce the stress
lemur groups shouldn't fight at all, this is what wiki says: Troops are classified as multi-male groups, with a matriline as the core group.[39] As with most lemurs, females socially dominate males in all circumstances, including feeding priority. Dominance is enforced by lunging, chasing, cuffing, grabbing and biting. Young females do not always inherit their mother's rank and young males leave the troop between three and five years of age. Both sexes have separate dominance hierarchies; females have a distinct hierarchy while male rank is correlated with age.
Wolves should not fight at all either, but mating should be monogamous
antelope groups should not have dominance fights more than once. the males in thous groups just don't mate in nature
+ many many more