There are fears the prehistoric monster Megalodon has returned to the seas after incredible bite marks were photographed on the side of a great white shark.
Diver Jalil Najafov, 40, spotted the scarred 15ft beast swimming off Isla Guadalupe in Mexico with a serious-looking wound which has sparked debate over what caused it.
While experts argue why another shark would have sunk its teeth so viciously into its own species, social media users have offered a more terrifying theory.
Jalil's Instagram post has led to speculation it could have come from a Megalodon, an ancient shark species regarded as one of the largest and most powerful predators to have ever lived.
Jalil said: “I was really surprised as I have never seen anything like this in my life."
The most common fossils that archaeologists have founder are that of the prehistoric creature’s teeth, which are larger than any shark’s teeth that they have ever seen.
This implies that the Megalodon is much larger than any shark today, Express.co.uk reports.
To understand the origins of the bite, Mr Najafov reached out to Dr Tristan Guttridge for his opinion.
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Dr Guttridge, who heads the marine nonprofit Saving the Blue, said: ”I’d rule out mating probably due to position as the wound looks like it’s healed a fair bit and, although mating scars can be nasty, they are more superficial than that.
“The shape of it to me likely indicates a bite from another shark – seems a bit extreme for defence but it’s a large shark itself so predation from another shark”
Another researcher, Michael Domeier weighed in, saying: “I’m confident this is competitive aggression.
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I keep hearing people (colleagues) describe this sort of thing as territorial aggression, but these highly migratory sharks don’t have a traditional territory.
“But they do not tolerate conspecifics except for the rare instances where there seems to be some social bond between certain individuals (documented in South Australia).
“That scar will heal to the point it won’t be a good distinguishing mark.”
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