Female mate choice, when males are coercing females into choice leading the evolution of ornaments. The female chooses the most attractive male who’s the best potential for good genes.
An example is when the female bird chooses a male bird with the best song.
Male-male competition, when there is a direct contest for access to mates which leads to the evolution of armaments.
An example would be male moose fighting with antlers to gain access to females.
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