More mutant fish are being discovered, probably as a result of genetic defects caused by overfishing. Two-headed sharks may seem like a movie prop, but they exist—and more are being discovered throughout the world, according to experts. A few years ago, fisherman off the coast of Florida caught a bull shark whose uterus housed a two-headed baby. Another fisherman found a … [Read more...] about No One Knows Why Two-Headed Sharks Keep Appearing