Final answer:
Male elk avoid fighting by posturing and bellowing as a form of display behavior, communicating their strength and dominance to intimidate their opponents and establish territory without physical combat.
Step-by-step explanation:
In male-male confrontations between elk, the males avoid fighting by posturing and bellowing as a form of display behavior. This behavior is used to show aggression and establish dominance without actually engaging in physical combat. By posturing and bellowing, the males communicate their strength and size to intimidate their opponent and discourage them from challenging their territory. This helps prevent injury and death, ensuring the survival of the elk population.