I spotted this male northern cardinal wrestling with a kiawe seed pod, but had to leave before I could see how the duel ended. I suspect the cardinal won. He was certainly putting in enough effort to do so.
Northern cardinal eating kiawe seed pod
Graham's Island
Life on the Big Island of Hawaii
Graham's Island 
Was the Northern Cardinal introduced to the island?
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I believe so. I think it was brought in back in the 1920s and is now pretty well established.
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