The viperfish is a swift swimmer, easily catching up to its prey. Once it reaches a small shrimp or fish, it unhinges its enormous jaw to impale the creature and trap it inside its mouth.

The viperfish (pictured above ... It may also be used to communicate with other stoplight loosejaws. The fish's jaw and neck are hinged so its mouth can open mouth wide and impale prey on needle-sharp ...

It's about the viperfish (Chauliodus sloani), also known ... Moreover, the ability to dislocate its jaw and expand its stomach allows this fish to swallow prey up to 63% of its own length.