This Hot-Tempered Sea Fish Has a Wider Mouth Than Body (Pics & Video)

Indeed, these fish are known for being big fighters. When two fringeheads battle for territory, they press their swollen mouths together, giving the impression that they are kissing – but in fact, they are actually determining who the larger fish is. The larger fish – or, more precisely, the fish with the larger jaw – wins dominance, meaning it bags the best den and a chance to mate. Then, the female lays thousands of eggs in the prized location and the male fertilizes them. He then defends his offspring with yet more oral aggro.