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Similar skull morphologies are found in seals and sea lions due to combat or to feeding style

Many carnivorans exhibit sexual dimorphism in the skeleton, variously due to aggression, feeding styles, or other behaviors. Some species of seals and sea lions only use vocal displays between males for access to mates and territory, but other species engage in outright combat between individuals. Species with higher intraspecific aggression are characterized by skulls with more crest development for the emplacement of biting muscles than less‐aggressive species. Are these more prominent skull characteristics due entirely to levels of aggression?