What's With This Bird Skeleton?

http://ddragon.leagueoflegends.com/cdn/img/champion/splash/Gnar_0.jpg http://www.pontonerd.com.br/images/posts/1084-league-of-legends-xayah-e-rakan-lutam-contra-zed-em-trailer-tb.png Just realized Gnar, Rakan, and Xayah have a nearly identical bird skull on their attire (and on a certain ones head) What is it? Edit: Or if its not the same bird, is it just some sort of fashion sense or displayable token of danger?
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