Two headed Sharks sound like something straight out of a horror film, or something thought up by the creative mind of a film writer. But the reality is that scientists are finding sharks with two heads all over the world, and its occurring with increasing frequency.

The main question on my mind when I heard about this was, "Are humans responsible?" After all, we have spent years polluting waterways with carelessly discarded pharmaceuticals, radioactive waste, and factory chemicals.

Blue sharks most a risk

However, scientists don't seem to believe that our recklessness has anything to do with this phenomenon. There have been reports that overfishing may be a culprit, as the sharks are finding fewer mates and thus creating genetic mutations due to a series of inbreeding.

In fact, researchers have stated that the blue shark has had the most occurrences of this mutation, and they believe that it just that; a simple genetic mutation. The blue shark is known to carry up to fifty embryos at once, and therefore, scientists think that they are at higher risk of developing polycephaly (multiple heads).

This trend isn't something that just happened yesterday. The first reports happened in 2008, when a fisherman caught a two headed baby blue shark off the coast of Australia. Then, in 2013, a group of fishermen caught a bull shark in Florida, and upon gutting it, found a two headed shark fetus inside of it.

Dr. Felipe Galván-Magaña believes that this is not a rising trend. In his opinion, we are simply hearing about more occurrences because there are more and more news sources that are reporting the issue.

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Multiple mutations

Most of the reports of two headed sharks appear to come from shark fetuses or embryos. While there have been sightings of adolescent sharks that have an extra head, researchers believe that many of these sharks simply don't survive into adulthood because of the mutation that occurs with their internal organs as well.

Whatever the reason for this unfortunate anomaly, one thing is certain: we should all hope that "Sharknado" never happens in real life, or we'll all be twice as screwed.