In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

First , they can compete when males use their antlers as weapons to compete for mates ; second , they can compete where males present their antlers to display their strength and fertility .
First , they can compete behaviorally where males use their antlers as weapons to compete for access to mates ; second , they can compete physiologically where males present their antlers to display their strength and fertility competitiveness to compete for access to mates .