Footage has emerged showing an incredible fight between two bizarre carnivorous fish of the same species – known as the sarcastic fringehead.

The alien-like creature has an enormous head atop their slender bodies, which the hyper-aggressive fish uses to defend its territory.

When challenged by an opponent, the sarcastic fringehead is able to expand its mouth – creating a nightmarish alien-like orifice that looks like something straight out of a horror movie.

BBC film crews captured this incredible interaction between two fringeheads during David Attenborough’s recent Life television series.

TERROR: Viewers have compared the sarcastic fringehead fish to a 'dangerous vagina'

The two predators compete by pressing their mouths against each other – like a horrifying kiss – in order to determine which of the two fish is the larger animal.

However, perhaps the most curious thing about the animal is its unique name – the sarcastic fringehead.

Luckily, one viewer had the answer.

“It is a non-standard use of the term 'sarcastic', that refers back to the word's origin - sarcasm is derived from the Greek word ’sarkazo’, meaning ‘to tear flesh’,” a Reddit user explained.

FACE OFF: The two fringeheads fight by pressing their mouths against each other

“Something these puppies can do rather well!”

Another comment simply read: “It looks like a dangerous vagina.”

Last month, fishermen in Malaysia were given the shock of a lifetime after they hauled accidentally mystery sea creature up from the deep.

The creature was thought to be an eel goby, although researchers were not able to provide confirmation.