Reports of two-headed sharks have increased through the years. Is it due to overfishing which reduces the size of the gene pool and allows for more of these genetic mutations to occur (think inbreeding)? Or is it just easier to report these observations (through scientific papers and social media)? It is a difficult topic to research since most of these sharks never survive. But it is a critical question that needs to be answered. Is it overfishing? Increased reporting? Pollution? Or something else entirely. Global shark populations are not doing well as it is, genetic mutations could be an additional silent threat.