Shark researchers are accustomed to surprises, but The Atlantic Shark Institute was taken off guard when something resembling an extinct megalodon shark appeared on sonar. Megalodons were 50 feet in length and had teeth 7 inches long, making them “one of the largest carnivores, if not superpredators, that have ever lived.” The species vanished about 3.6 million years ago, experts say. Still, a research team recently spotted something that … Continue reading Sonar Showed a 50 Foot Shark Nearing Boat Off New England