On the heels of Valentine’s Day this week, I was thinking of how silly it is that when we humans try to make a kissy face, we often end up sucking our cheeks in to make fish lips. And yet ...

Unlike all other fish, whose jaw joint sits behind their mouth, the hingemouth’s jaw joint is at the front of its head. The lower jaw is flipped backwards, pointing towards the throat.

But when the passerby was another of the same species, the resident fish often gaped its mouth. The researchers trapped 15 sarcastic fringehead males and brought them back to the lab, where they ...

the fish try to intimidate their opponents by opening their jaws wide to display the bright colors inside. "The mouth's intimidating coloration, combined with the extreme nature of its size (which ...

Fish having ... to its head size, making up just over half of its head length. In fact, its fang-like, not-so-pearly whites are so long that they overlap the jaws when its mouth is closed.